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The Salamander That Refuses to Grow Up

Video vocabulary

underwater

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US / ˌʌndəˈwɔ:tə(r) /

UK / ˈʌndɚˌwɔtɚ, -ˌwɑtɚ /

C2
  • adjecitve
  • (Moving or existing) beneath the surface of water

while

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US / waɪl /

UK / hwaɪl, waɪl /

A1
  • conjunction
  • In spite of the fact that; although
  • During the time that; at the same time
  • noun
  • Short amount of time

childish

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US / ˈtʃaɪldɪʃ /

UK / ˈtʃaɪldɪʃ /

A2
  • adjecitve
  • Typical of a child in being silly or immature

retain

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US / rɪ'teɪn /

UK / rɪˈten /

A2
  • verb
  • To continue to have or use; keep the quality of
  • To keep one thing inside another for a time
  • To memorize information

dramatically

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US / drə'mætɪklɪ /

UK / drəˈmætɪkl:ɪ /

B1
  • adverb
  • In a sudden or extreme manner

develop

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US / dɪ'veləp /

UK / dɪˈvɛləp /

A1
  • verb
  • To explain something in steps and in detail
  • To create or think of something
  • To grow bigger, more complex, or more advanced
  • To make a photograph from film

gene

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US / dʒi:n /

UK / dʒin /

B1
  • noun
  • Part of cell controlling development of a thing

here

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US / hɪə(r) /

UK / hɪr /

A1
  • adverb
  • In this place; at this location, position or time

lose

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US / lu:z /

UK / luz /

A1
  • verb
  • To be unable to keep in check or control something
  • To decrease in value or quantity (e.g. weight)
  • To stop having certain qualities or abilities
  • To stop having or being entitled to
  • To fail to win something that is being contested
  • To be unable to find something you once had
  • To be dependent on someone (used with 'not')

refusal

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US / rɪˈfju:zl /

UK / rɪˈfjuzəl /

A2
  • noun
  • Act of not accepting, giving, or doing

try

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US / traɪ /

UK / traɪ /

A1
  • noun
  • Act of putting the ball over the rugby goal line
  • verb
  • To make an effort, to attempt to do something
  • To examine someone or something in a court of law
  • To test to see if it is good or you like it
  • To make a person go through hardship; test
  • To examine something to see if it works

frilly

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US / ˈfrɪli /

UK / ˈfrɪli /

C1
  • adjecitve
  • Having decorative ruffles or frills

fortunately

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US / ˈfɔ:tʃənətli /

UK / ˈfɔ:rtʃənətli /

A2
  • adverb
  • Through good luck; luckily

weird

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US / wɪəd /

UK / wɪrd /

B1
  • adjecitve
  • Odd or unusual; surprising; strange

actually

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US / ˈæktʃuəli /

UK / ˈæktʃuəli /

A1
  • adverb
  • Used to add new (often different) information

stick

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US / stɪk /

UK / stɪk /

A2
  • noun
  • Long thin piece of wood from a tree
  • verb
  • To push a sharp or pointed object into something
  • To join together using glue or paste
  • To remain in one place or position for a long time

age

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US / eɪdʒ /

UK / edʒ /

A1
  • verb
  • To keep food, wine for a long time to improve it
  • To get older
  • noun
  • Period of time in history
  • Number of years a person or thing has lived

aquarium

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US / ə'kweərɪəm /

UK / əˈkwɛriəm /

B1
  • noun
  • Building or tank for keeping fish and water plants

should

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US / ʃʊd /

UK / ʃʊd /

A1
  • other
  • Used to indicate what is proper or reasonable

sort

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US / sɔ:t /

UK / sɔrt /

A1
  • noun
  • Group or class of similar things or people
  • verb
  • To organize things by putting them into groups
  • To deal with things in an organized way

after

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US / 'ɑ:ftə(r) /

UK / ˈæftɚ /

A1
  • adverb
  • Later than another time, or behind something
  • conjunction
  • Following something before
  • preposition
  • When an event happened or time has passed

episode

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US / 'epɪsəʊd /

UK / ˈɛpɪˌsod /

B1
  • noun
  • One separate event in a series of events
  • Show which is part of a larger story

many

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US / 'menɪ /

UK / ˈmɛni /

A1
  • determiner
  • Used to refer a large number of things

regulate

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US / ˈregjuleɪt /

UK / ˈrɛɡjəˌlet /

A2
  • verb
  • To control something with rules or laws
  • To set/adjust (a clock, etc.); restrict motion in

relate

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US / rɪ'leɪt /

UK / rɪˈlet /

A2
  • verb
  • To demonstrate a logical relationship between
  • To understand or sympathize with, e.g. a problem
  • To tell a story, or tell about a particular event

tail

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US / teɪl /

UK / tel /

A2
  • noun
  • Extended part at the back of an animal's body
  • Back or last part of something e.g. shirt
  • verb
  • To be end of (a march or parade, line)
  • To follow someone secretly and watch what they do

affect

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US / ə'fekt /

UK / əˈfɛkt /

A2
  • verb
  • To cause a change in something else

morph

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US / mɔ:f /

UK / mɔ:rf /

C2
  • verb
  • (Of computer animation) to gradually change shape

only

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US / ˈəunli /

UK / ˈonli /

A1
  • adverb
  • Just one; just that amount or thing; not more than
  • Not very important or serious
  • Just that type of thing, person
  • Short time ago; not before a certain time
  • conjunction
  • Except; but

any

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US / 'enɪ /

UK / ˈɛni /

A1
  • adjecitve
  • One, or some, no matter which
  • pronoun
  • One (thing) of many; some

experiment

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US / ɪk'sperɪmənt /

UK / ɪkˈspɛrəmənt /

A2
  • noun
  • Test performed to assess new ideas or theories
  • verb
  • To create and perform tests to research something
  • To try something new that you haven't tried before

help

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US / help /

UK / hɛlp /

A1
  • noun
  • Something given to enable a person to do something
  • Assistance given to someone in need
  • Someone who makes something easier or possible
  • verb
  • To act to enable a person to do something; assist
  • To make something better or less difficult

think

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US / θɪŋk /

UK / θɪŋk /

A1
  • verb
  • To have an idea about something without certainty
  • To have an idea, opinion or belief about something

and

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US / ənd /

UK / ənd, ən,ænd /

A1
  • conjunction
  • Used to refer to two or more things
  • Plus; in addition; on top of that
  • Used to introduce an action that follows another

axolotls

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US / /

UK / /

A1
  • other

external

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US / eksˈtə:nl /

UK / ɪkˈstɚnəl /

A2
  • adjecitve
  • Concerning foreign countries
  • Concerning the outside of something; outer
  • Coming from the outside

intro

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US / ˈɪntrəʊ /

UK / ˈɪntroʊ /

A1
  • noun
  • Opening part of a text or piece of music

lot

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US / lɒt /

UK / lɑt /

A1
  • noun
  • What happens to a person in life from chance; fate
  • A group of people seen together
  • Item for sale at an auction
  • Small area of land used for a purpose e.g. parking

another

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US / əˈnʌðə(r) /

UK / əˈnʌðɚ /

A1
  • adjecitve
  • One more, but not this
  • determiner
  • One more added
  • pronoun
  • One more (thing)

complex

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US / 'kɒmpleks /

UK / kəmˈplɛks, ˈkɑmˌplɛks /

A2
  • adjecitve
  • Not being simple; having many parts or aspects
  • noun
  • Group of buildings all used for the same purpose
  • Psychological issue regarding self-image

environment

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US / ɪn'vaɪrənmənt /

UK / ɛnˈvaɪrənmənt, -ˈvaɪən- /

A1
  • noun
  • Natural world in which plants and animals live
  • The entire surrounding conditions of something

reabsorb

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US / ˌrɪəb'sɔ:b /

UK / ˌrɪrb'sɔ:b /

A1
  • other
  • Undergo resorption

early

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US / ˈɜ:li /

UK / ˈɜ:rli /

A1
  • adjecitve
  • Happening or appearing before
  • adverb
  • Coming/happening before others in a time sequence
  • Happening sooner than expected

chemistry

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US / 'kemɪstrɪ /

UK / ˈkɛmɪstri /

B1
  • noun
  • The study of the structure of substances

larva

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US / ˈlɑ:və /

UK / ˈlɑ:rvə /

B2
  • noun
  • Wormlike young form of some insects

mess

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US / mes /

UK / mɛs /

A2
  • noun
  • Something that is untidy, dirty or unclean
  • verb
  • To make something untidy or dirty

peter

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US / ˈpi:tə(r) /

UK / ˈpitɚ /

A1
  • noun
  • Disciple of Jesus and leader of the Apostles; regarded by Catholics as the vicar of Christ on earth

something

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US / ˈsʌmθɪŋ /

UK / ˈsʌmθɪŋ /

A1
  • adverb
  • In some degree or measure
  • noun
  • a person or thing of some value or consequence
  • pronoun
  • Thing that is not yet known or named
  • Approximately

from

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US / frəm /

UK / frʌm, frɑm,frəm /

A1
  • preposition
  • Starting at a particular place, time or level

out

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US / aʊt /

UK / aʊt /

A1
  • adverb
  • No longer stylish (e.g. fashion)
  • Away from home, business, or the usual place
  • In a direction/movement away from inside or center
  • noun
  • Act when a batter cannot continue playing
  • verb
  • To tell people a secret

call

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US / kɔ:l /

UK / kɔl /

A1
  • noun
  • A order or request for action
  • The sound an animal makes, often when in danger
  • A correct prediction, e.g. a decision in a game
  • A short visit to a place or person
  • A decision by a referee or umpire in a game
  • verb
  • To make a request or order for action
  • (Animal) to make sounds to warn of danger
  • To announce the date of an election
  • To make a judgment about something
  • To give someone or something a name
  • To guess in advance the result or outcome
  • To visit a place or person for a short time
  • To phone someone
  • To speak, announce or shout in a loud voice

leave

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US / li:v /

UK / liv /

A1
  • noun
  • Permission to do something
  • Vacation time; time off work
  • verb
  • To go away from; depart
  • To gift property to someone after you die
  • To allow something to continue happening
  • To let something remain unused or available
  • To let something or someone remain somewhere

picture

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US / 'pɪktʃə(r) /

UK / ˈpɪktʃɚ /

A1
  • noun
  • General situation or state of being
  • Mental image of what something is or looks like
  • Movie; film
  • Painting, drawing or photograph on paper or screen
  • verb
  • To understand or imagine something
  • To imagine someone or something in an image

trait

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US / treɪt /

UK / tret /

C2
  • noun
  • A particular characteristic that can produce a particular type of behavior

appearance

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US / əˈpɪərəns /

UK / əˈpɪrəns /

A2
  • noun
  • The way a person looks to others
  • The way that something looks

lifestyle

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US / ˈlaɪfstaɪl /

UK / ˈlaɪfˌstaɪl /

B1
  • noun
  • The type of life that you have; the way you live

adolescence

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US / ˌædəˈlesns /

UK / ˌædlˈɛsəns /

B2
  • noun
  • Developmental period typically in the teen years

feed

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US / fi:d /

UK / fid /

A2
  • noun
  • Food given to animals
  • verb
  • To give food, e.g. to animals or a baby
  • To push something through an opening
  • To provide necessary supplies to

hear

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US / hɪə(r) /

UK / hɪr /

A1
  • verb
  • To be aware of sound; to perceive with the ear
  • To be told or find out information or facts
  • To consider or listen to a court case

full

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US / fʊl /

UK / fʊl /

A1
  • adjecitve
  • Containing all the parts; complete
  • Containing or holding as much as possible
  • Having had enough food
  • adverb
  • In a direct manner; completely

intake

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US / ˈɪnteɪk /

UK / ˈɪnˌtek /

B1
  • noun
  • Amount of something that a person's body consumes
  • Act of consuming something
  • Opening where air or liquid enters a machine

process

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US / prə'ses /

UK / ˈprɑsˌɛs, ˈproˌsɛs /

A2
  • noun
  • Dealing with official forms in the way required
  • Set of changes that occur slowly and naturally
  • verb
  • To organize and use data in a computer
  • To deal with official forms in the way required
  • To prepare by treating something in a certain way
  • To adopt a set of actions that produce a result
  • To convert by putting something through a machine

with

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US / wɪð /

UK / wɪð, wɪθ /

A1
  • preposition
  • As an employee of a certain company
  • Against something or someone
  • By using something as a means
  • Due to; because of
  • Including
  • Possessing as a feature
  • Related to
  • (Of the manner/attitude by which you do something)
  • Used to express that people or things are together

extra

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US / 'ekstrə /

UK / 'ekstrə /

A2
  • adjecitve
  • More than necessary; additional
  • noun
  • Items more than you need; additional items
  • Person who has a small part in a movie
  • Special version of a newspaper

have

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US / həv /

UK / hæv /

A1
  • verb
  • To drink, smoke, eat or use something
  • To experience the effects of something
  • To organize an event, or join in an activity
  • To own, possess, or hold something
  • To cause to happen or produce a particular effect

lung

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US / lʌŋ /

UK / lʌŋ /

B1
  • noun
  • One of the two organs we use to breathe

part

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US / pɑ:t /

UK / pɑ:rt /

A1
  • adjecitve
  • To some degree; half; not fully
  • noun
  • Division of a book
  • Ratio of something, e.g. 3 of gin, 1 of tonic
  • A line in a person's hair, made with a comb
  • Character an actor plays on stage, movie, or TV
  • Some, but not all of a specific thing
  • Role in causing something to happen
  • verb
  • To make a line in a person's hair, by using a comb
  • To move two things apart creating a space
  • To leave someone, or to break off a relationship

could

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US / kəd /

UK / kʊd /

A1
  • other
  • Past form of 'can' to mean have ability
  • Used to ask for something politely, or to offer

know

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US / nəʊ /

UK / noʊ /

A1
  • verb
  • To be familiar with a person or place, thing
  • To feel sure or be convinced about something
  • To discover or be aware of something
  • To be able to distinguish
  • To have knowledge of things

mature

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US / məˈtʃʊə(r) /

UK / məˈtʃʊr /

A2
  • adjecitve
  • Behaving like an adult
  • Being fully developed physically
  • verb
  • (Wine, cheese) To age to improve its taste

world

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US / wɜ:ld /

UK / wɜrld /

A1
  • noun
  • All the humans, events, activities on the earth
  • Political division due to some kind of similarity

induce

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US / ɪn'dju:s /

UK / ɪnˈdus, -ˈdjus /

B1
  • verb
  • To make someone do something; create an outcome
  • To make a woman give birth by giving her medicine

scientist

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US / ˈsaɪəntɪst /

UK / ˈsaɪəntɪst /

A2
  • noun
  • Person who is trained in a science

community

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US / kə'mju:nətɪ /

UK / kəˈmjunɪti /

A2
  • noun
  • Group of people who share a common idea or area

low

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US / ləʊ /

UK / lo /

A1
  • adjecitve
  • Having a small quantity, supply, or amount
  • Being unhappy or unpleasant in attitude
  • Not high; being near the ground, or bottom
  • (Of a voice, sound) being soft; quiet
  • noun
  • Situation of not having a lot of something

add

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US / æd /

UK / æd /

A1
  • verb
  • To include as well
  • To put two things or numbers together, e.g. 2+2

glow

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US / ɡləʊ /

UK / ɡlo /

B1
  • noun
  • Pink color in the face, e.g. from exercise/emotion
  • Pleasant feeling, as of happiness or satisfaction
  • Soft, steady light given off without a flame
  • verb
  • To look very healthy and contented
  • To emit a steady even light

take

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US / teɪk /

UK / tek /

A1
  • noun
  • Filming of a single scene for TV or the movies
  • verb
  • To accept something that is offered
  • To use a method of traveling, e.g. a bus or train
  • To use a camera to make (a photo)
  • To pick up something and go away with it
  • To study a subject in school
  • To attempt to pass (an exam)
  • To require a certain amount of time, money, space

all

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US / ɔ:l /

UK / ɔl /

A1
  • adverb
  • Completely; totally
  • determiner
  • Being every one of something
  • pronoun
  • 100% of something; the complete amount

its

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US / ɪts /

UK / ɪts /

A1
  • adjecitve
  • Referring to or belonging to ‘it’
  • determiner
  • Of something; belonging or related to something
  • other
  • Possessive form of “it”

strange

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US / streɪndʒ /

UK / strendʒ /

A1
  • adjecitve
  • Unusual or odd; surprising because unexpected

who

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US / hu: /

UK / hu /

A1
  • pronoun
  • Which person
  • Used to introduce information about people

heart

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US / hɑ:t /

UK / hɑrt /

A1
  • noun
  • A feeling of care for others; compassion
  • Courage, confidence, and emotional strength
  • Be cheerfully encouraging
  • Most essential, important, or central part
  • Referring to a promise or something important
  • State or feelings of affection or deep love
  • Core part of a vegetable, e.g. a lettuce
  • The part of the body that pumps blood
  • Place where emotions are believed to be felt
  • A shape that represents love

their

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US / ðɛː /

UK / ðer /

A1
  • determiner
  • Belonging to them

feature

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US / 'fi:tʃə(r) /

UK / ˈfitʃɚ /

A2
  • adjecitve
  • Main; important
  • noun
  • Special report in a magazine or paper
  • Distinctive or important point of something
  • verb
  • To highlight or give special importance to

both

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US / bəuθ /

UK / boθ /

A1
  • determiner
  • Used to refer to two things at the same time
  • pronoun
  • Used to refer to two things at the same time

change

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US / tʃeɪndʒ /

UK / tʃendʒ /

A1
  • noun
  • Exchange of one set of clothes for another
  • Money in the form of coins instead of paper
  • Money returned after giving too much
  • Act of making or becoming something else
  • verb
  • To exchange one set of clothes for another
  • To exchange one kind of money for another
  • To replace something with another thing
  • To make or become something else
  • To go from one train, bus, etc. and go to another

fin

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US / fɪn /

UK / fɪn /

B2
  • noun
  • Flat, thin body parts of a fish that help it swim
  • Flat, thin object that sticks out from something

functional

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US / ˈfʌŋkʃənl /

UK / ˈfʌŋkʃənəl /

A2
  • adjecitve
  • Useful; not just for decoration

human

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US / 'hju:mən /

UK / ˈhjumən /

A1
  • adjecitve
  • Concerning or characteristic of people
  • noun
  • A person; a man, woman or child

look

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US / lʊk /

UK / lʊk /

A1
  • noun
  • Person's beauty or physical attractiveness
  • Particular style of dress, clothes, or appearance
  • The way someone, something appears to be
  • Act of searching for or examining something
  • verb
  • To appear to be; seem

scishow

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US / /

UK / /

A1

swimming

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US / ˈswɪmɪŋ /

UK / ˈswɪmɪŋ /

A1
  • noun
  • The act of moving through water
  • verb
  • To move through water by moving parts of the body

thank

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US / θæŋk /

UK / θæŋk /

A1
  • verb
  • To tell someone you are grateful to them

ancestor

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US / 'ænsestə(r) /

UK / ˈænˌsɛstɚ /

B1
  • noun
  • A person from your family that lived in the past

laboratory

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US / lə'bɒrətrɪ /

UK / ˈlæbrəˌtɔri, -ˌtori /

B1
  • noun
  • A place to do scientific experiments

otherwise

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US / ˈʌðəwaiz /

UK / ˈʌðɚˌwaɪz /

A2
  • adverb
  • In an additional or different way
  • Unless; or

they

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US / ðeɪ /

UK / ðe /

A1
  • pronoun
  • Two or more people, animals, or things

toad

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US / təʊd /

UK / tod /

B2
  • noun
  • Small amphibian animal very similar to a frog
  • A person you don't like or have respect for

dry

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US / draɪ /

UK / draɪ /

A1
  • adjecitve
  • (Of humor) clever, but not obvious; ironic
  • Without water; not wet
  • (Of wine, etc.) not sweet
  • Without butter or jam
  • verb
  • To remove liquid or water from something

jumpstart

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US / /

UK / /

A1
  • other
  • Start (a car engine whose battery is dead) by connecting it to another car's battery
  • Start or re-start vigorously
  • Starting an automobile engine that has a weak battery by means of jumper cables to another car

main

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US / meɪn /

UK / men /

A1
  • adjecitve
  • Most important; most often used

possible

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US / ˈpɒsəbl /

UK / ˈpɑsəbəl /

A1
  • adjecitve
  • Being able or appropriate for a task or purpose
  • Having a chance of happening, or being true

vertebrate

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US / ˈvɜ:təbrɪt, -ˌbreɪt /

UK / ˈvə:təbrɪt, -ˌbret /

C1
  • adjecitve
  • Having a backbone
  • noun
  • Animal with a backbone

control

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US / kən'trəʊl /

UK / kənˈtrol /

A1
  • noun
  • A device designed to operate a machine
  • Participant in experiment that is left untouched
  • Act to dominate or command; make manageable
  • A law limiting the growth or spread of something
  • A place which overseas or manages e.g. a factory
  • verb
  • To direct or influence the behavior of something

light

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US / laɪt /

UK / laɪt /

A1
  • adjecitve
  • Being bright making it easy to see; not dark
  • Being pale and lacking darkness of color
  • Not heavy; weighing only a little
  • adverb
  • Carrying few bags when traveling
  • noun
  • A source of energy that makes a room or area bright
  • Way in which something or someone is understood
  • verb
  • To cause something to burn; put a burning match to
  • To provide a way to see ahead

limb

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US / lɪm /

UK / lɪm /

B1
  • noun
  • Leg, arm, branch or wing
  • Part of something that extends out over an area

those

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US / ðəʊz /

UK / ðoz /

A1
  • determiner
  • The people or things we are talking about
  • pronoun
  • The objects far from the speaker

though

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US / ðəu /

UK / ðo /

A1
  • adverb
  • Although, despite the fact that

exploit

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US / ɪk'splɔɪt /

UK / ɪkˈsplɔɪt /

B1
  • noun
  • Personal journey or series of events
  • verb
  • To selfishly take advantage of or treat badly
  • To use something in a very effective manner

such

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US / sʌtʃ /

UK / sʌtʃ /

A1
  • determiner
  • Being similar to
  • (Thing) as previously stated or referred to
  • adverb
  • (Used to emphasize the quality of an adjective)

water

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US / 'wɔ:tə(r) /

UK / ˈwɔtɚ, ˈwɑtɚ /

A1
  • noun
  • Clear liquid that forms the seas, rivers and rain
  • Large area such as an ocean or sea
  • verb
  • (Of the eyes) to produce tears
  • (Mouth) to become wet at the thought of nice food
  • To pour liquids onto a plant to keep it alive

capable

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US / 'keɪpəbl /

UK / ˈkepəbəl /

A2
  • adjecitve
  • Being able to do something very well; proficient

evolve

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US / ɪ'vɒlv /

UK / ɪˈvɑlv /

B1
  • verb
  • To develop certain features
  • To develop or change slowly over time
  • To slowly change or develop into something better

much

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US / mʌtʃ /

UK / mʌtʃ /

A1
  • adjecitve
  • Very; to a high level or degree
  • adverb
  • A lot; large amount; a high degree of
  • Nearly; basically
  • On many occasions; often
  • noun
  • A large amount; a great quantity

grow

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US / ɡrəʊ /

UK / ɡro /

A1
  • verb
  • To get bigger and more mature; make plants do this
  • To improve; to develop better skills over time
  • To develop and become bigger or taller over time

land

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US / lænd /

UK / lænd /

A1
  • noun
  • Region or country
  • Earth; the ground
  • verb
  • To arrive or cause a boat to arrive at the shore
  • To obtain or get something that you wanted
  • To (cause to) come down to the ground safely
  • To cause to arrive in a specific place or state

lower

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US / 'ləʊə(r) /

UK / ˈlaʊɚ, laʊr /

A2
  • adjecitve
  • In a position more near the bottom
  • verb
  • To move something downward to the ground

piece

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US / pi:s /

UK / pis /

A1
  • noun
  • A counter in a board game
  • Small part of something larger
  • verb
  • To put items together to assemble something

since

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US / sɪns /

UK / sɪns /

A1
  • adverb
  • At a point before the present time
  • conjunction
  • For this reason; because
  • preposition
  • From the time in the past that

test

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US / test /

UK / test /

A1
  • noun
  • A medical examination
  • Action to establish the truth or nature of
  • Examination; questions to measure knowledge
  • verb
  • To be given a medical examination
  • To try to establish the truth or nature of
  • To ask a series of questions to measure knowledge

unique

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US / jʊ'ni:k /

UK / juˈnik /

A2
  • adjecitve
  • Unlike other things; being the only one like it

start

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US / stɑ:t /

UK / stɑrt /

A1
  • noun
  • First time or place that a thing exists; beginning
  • First opportunity to achieve something, e.g. a job
  • Sudden action or movement because you are scared
  • other
  • Beginning of something in place or time
  • verb
  • To do, be or happen for the first time; begin
  • To turn something on

well

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US / wel /

UK / wɛl /

A1
  • adjecitve
  • Being in a fortunate, good condition or state
  • Healthy and in good condition
  • adverb
  • In an acceptable, proper, or successful manner
  • In a complete, total, or full manner
  • A great and considerable degree
  • In a successful way, in a good or satisfactory way
  • exclamation
  • Used to begin or continue a particular statement
  • Used to show you want to start saying something
  • Used to express that you are waiting for a reply
  • You say this to change the topic of a conversation
  • Used to indicate you are making a final remark
  • noun
  • Long deep hole in the ground to get water
  • verb
  • To cause your eyes to fill with tears

animal

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US / ˈænɪml /

UK / ˈænəməl /

A1
  • noun
  • A living creature that is not a plant or person

cellular

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US / 'seljələ(r) /

UK / ˈsɛljəlɚ /

B2
  • adjecitve
  • Concerning a cell of a living thing
  • (Of radio signals) functioning without wires

just

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US / dʒʌst /

UK / dʒʌst /

A1
  • adjecitve
  • Proper or appropriate; as is deserved
  • Doing or being what is right or fair
  • Legally correct; having enough evidence
  • adverb
  • Almost; nearly
  • Exactly at the time of
  • Exactly (the same as, like)

fully

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US / 'fʊlɪ /

UK / ˈfʊli /

A1
  • adverb
  • Completely or entirely

leg

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US / leɡ /

UK / lɛɡ /

A1
  • noun
  • Part of the body from the hips down
  • The piece of furniture that touches the ground

period

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US / ˈpɪəriəd /

UK / ˈpɪriəd /

A1
  • noun
  • Set amount of time during which events take place
  • A way to emphasize what you will say
  • A full stop (.), marking the end of a sentence
  • A menstrual cycle
  • A set time for a class to be held

never

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US / 'nevə(r) /

UK / ˈnɛvɚ /

A1
  • adverb
  • Not ever; not at any time

for

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US / fə(r) /

UK / fɔr,fə /

A1
  • preposition
  • Used to show the purpose, or need of something

time

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US / taɪm /

UK / taɪm /

A1
  • noun
  • Speed at which music is played; tempo
  • Point as shown on a clock, e.g. 3 p.m
  • Number of hours, minutes needed to do something
  • Occasion when something happens
  • Period or occasion that something occurred
  • Period in history or the past
  • Something measured in minutes, hours, days, etc.
  • How long an event takes; duration
  • verb
  • To check speed at which music is performed
  • To choose a specific moment to do something
  • To measure how long an event takes, e.g. a race
  • To schedule something to occur at a specific moment

undergo

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US / ˌʌndəˈgəʊ /

UK / ˌʌndərˈgoʊ /

B1
  • verb
  • To experience or endure something (bad)

worth

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US / wɜ:θ /

UK / wɚθ /

A2
  • other
  • the financial, practical or moral value of somebody/something
  • having a particular value, especially in money

why

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US / waɪ /

UK / hwaɪ, waɪ /

A1
  • adverb
  • Question word to ask for a reason
  • exclamation
  • (Used to express surprise or approval)

breathing

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US / ˈbri:ðɪŋ /

UK / ˈbriðɪŋ /

A2
  • verb
  • To move air into and out of your lungs
  • To say something very softly
  • To stop moving so one can rest

dramatic

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US / drəˈmætɪk /

UK / drəˈmætɪk /

B1
  • adjecitve
  • Gripping the attention; causing an effect
  • (Of an event) sudden and extreme

body

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US / ˈbɒd.i /

UK / ˈbɑdi /

A1
  • noun
  • An object distinct from other objects
  • A group of people involved in an activity together
  • Main part of something
  • A person's physical self

make

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US / meɪk /

UK / mek /

A1
  • noun
  • Product made by a particular company; brand
  • verb
  • To arrange or prepare something e.g. dinner
  • To get to (a place) on time
  • To gain the status of (teacher, lawyer, etc.)
  • To create something by putting things together
  • To earn a certain amount of money at a job
  • To cause or force a person to do something
  • To cause something to happen or be formed

suggest

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US / səˈdʒest /

UK / səɡˈdʒɛst, səˈdʒɛst /

A1
  • verb
  • To mention something that could be done; propose

easily

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US / ˈi:zəli /

UK / ˈizəli /

A1
  • adverb
  • Clearly; without doubt; certainly
  • Without difficulty

might

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US / maɪt /

UK / maɪt /

A1
  • other
  • Used to politely request an action
  • Used to express that something could happen
  • Power, strength, force or influence

researcher

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US / rɪ'sɜ:tʃə(r) /

UK / rɪˈsətʃɚ /

A2
  • noun
  • Someone who works to find new facts and ideas

seasonally

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US / ˈsiːzənli /

UK / ˈsizənəli /

B1
  • adverb
  • At a particular time of year

the

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US / ðə /

UK / ðə /

A1
  • article
  • Used to refer to something already mentioned
  • Used to show there is only one of something
  • determiner
  • Used to describe all of a family

also

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US / 'ɔ:lsəʊ /

UK / ˈɔlso /

A1
  • adverb
  • In addition; too; in a similar way

identify

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US / aɪ'dentɪfaɪ /

UK / aɪˈdɛntəˌfaɪ /

B1
  • verb
  • To indicate who or what someone or something is

hormone

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US / 'hɔ:məʊn /

UK / ˈhɔrˌmon /

B2
  • noun
  • Chemical produced by the body to control functions

how

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US / haʊ /

UK / haʊ /

A1
  • adjecitve
  • To what degree? in what amount?
  • adverb
  • (Used to explain the way to do something)
  • exclamation
  • For what purpose or reason?
  • (Used to ask someone or something's condition)

thyroid

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US / ˈθaɪrɔɪd /

UK / ˈθaɪˌrɔɪd /

A1
  • adjecitve
  • Of thyroid gland or cartilage in neck or throat

you

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US / jʊ /

UK / ju /

A1
  • pronoun
  • Person someone is speaking or writing to
  • Person or people in general

play

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US / pleɪ /

UK / pleɪ /

A1
  • noun
  • Loose, free movement between two objects
  • Single action in a sports game
  • Performance in which people act in a theater
  • verb
  • To act as a character in a movie, or on stage
  • To perform music on an instrument
  • To use a device, e.g. a video game
  • To do something for enjoyment and fun
  • To do or perform a game or sport

this

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US / ðɪs /

UK / ðɪs /

A1
  • adjecitve
  • Used to indicate something already been discussed
  • Used to indicate something happening around now
  • adverb
  • An indication by a physical motion or gesture
  • A specific amount of
  • determiner
  • Person, thing, or idea near you
  • pronoun
  • Person, thing that has already been discussed

word

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US / wɜ:d /

UK / wɚd /

A1
  • noun
  • Unit of language that has a meaning
  • Promise
  • Short remark or piece of information
  • verb
  • To express something by choosing particular words

into

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US / 'ɪntə /

UK / ˈɪntu /

A1
  • preposition
  • Moving or going inside something
  • In the same direction as; in the direction of
  • So as to become; taking the state of

other

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US / 'ʌðə(r) /

UK / ˈʌðər /

A1
  • adjecitve
  • A thing different from that mentioned
  • determiner
  • (Something) else; not the first (one)
  • pronoun
  • Being the one and only thing of that category

regrow

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US / ri:greʊ /

UK / ri:greʊ /

B1
  • verb
  • To continue growth after an injury or interruption

relative

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US / ˈrelətɪv /

UK / ˈrɛlətɪv /

A2
  • adjecitve
  • Measured or considered in comparison to another
  • (Grammar) referring to words that appear earlier
  • noun
  • Members of the family
  • Humans or animals sharing the same family history

turn

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US / tɜ:n /

UK / tɚn /

A1
  • noun
  • Place where changing of direction happens
  • Your time or chance to perform a duty
  • Your chance to play or do in say a game
  • Unexpected change, as in the weather
  • verb
  • To become (a particular age)
  • To become a different quality, color, etc.
  • To change the direction of something, e.g. a car
  • To move in an opposite direction or position
  • To shape metal with a spinning tool

than

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US / ðən /

UK / ðən /

A1
  • conjunction
  • Used to compare two things that are not equal

adulthood

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US / 'ædʌlthʊd /

UK / 'ædʌlthʊd /

B1
  • noun
  • Time of life when a person is fully grown

multiple

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US / ˈmʌltɪpl /

UK / ˈmʌltəpəl /

B1
  • adjecitve
  • Having or involving more than one of something
  • noun
  • Number produced by multiplying a smaller number
  • Shop with many branches

sexually

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US / 'sekʃəlɪ /

UK / ˈsɛkʃʊəlɪ /

A2
  • adverb
  • In a way or manner that involves sex

vital

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US / 'vaɪtl /

UK / 'vaɪtl /

B1
  • adjecitve
  • Needed to support life; essential
  • Full of life; energetic

amphibian

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US / æmˈfɪbiən /

UK / æmˈfɪbiən /

B2
  • noun
  • Cold-blooded animal that lives on land or in water

level

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US / 'levl /

UK / ˈlɛvəl /

A2
  • adjecitve
  • (Sports) equal to another
  • Being steady and determined (e.g. a voice)
  • noun
  • Specific height of something
  • Amount of ability you have compared to others
  • Floor or deck within a building
  • Tool used to determine if something is lying flat
  • verb
  • To aim a gun at someone
  • To destroy a building; flatten an area completely
  • To make things flat or even
  • To make a score equal to another, in sports

physical

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US / ˈfɪzɪkl /

UK / ˈfɪzɪkəl /

A2
  • adjecitve
  • Concerning the body of a person
  • Concerning things that can be seen or touched
  • noun
  • Health check at the doctors' or hospital

state

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US / steɪt /

UK / stet /

A1
  • adjecitve
  • Concerning region within a country
  • noun
  • Region within a country, with its own government
  • Situation or condition something is in
  • verb
  • To say; declare as fact

thyroxine

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US / θaɪˈrɒksiːn; -sɪn /

UK / /

A1
  • noun
  • Hormone produced by the thyroid glands to regulate metabolism by controlling the rate of oxidation i

ability

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US / ə'bɪlətɪ /

UK / əˈbɪlɪti /

A2
  • noun
  • The power, resources or skill to do something

but

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US / bət /

UK / bʌt,bət /

A1
  • conjunction
  • Used before you say something different, opposite

demonstrate

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US / 'demənstreɪt /

UK / ˈdɛmənˌstret /

A2
  • verb
  • To display a feeling or ability openly
  • To protest about something often as a group
  • To prove or make clear by reasoning or evidence
  • To show how something works (e.g. product)

generally

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US / /

UK / /

A2
  • adverb
  • Usually; as a rule; by, to or for most people

life

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US / laɪf /

UK / laɪf /

A1
  • noun
  • All the living things e.g. animals, plants, humans
  • Period of time things live, from birth to death

patron

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US / 'peɪtrən /

UK / ˈpetrən /

B2
  • noun
  • Person buying products or services of a business
  • Someone who donates to an organization or activity

signal

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US / 'sɪɡnəl /

UK / ˈsɪɡnəl /

A2
  • adjecitve
  • Most important or most noticeable
  • noun
  • Movement of a hand or other means to send messages
  • Act/sound that tells people to do/start something
  • Road-side lights that direct traffic to go or stop
  • Sound and light waves carrying TV and radio data
  • verb
  • To be evidence/an indication something will happen
  • To make a noise or motion to tell someone to start

triiodothyronine

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US / ˌtraɪaɪˌəʊdəʊˈθaɪrəˌniːn /

UK / traɪˈaɪədoʊˈθaɪrəˌnɪn /

A1
  • other
  • Thyroid hormone similar to thyroxine but with one less iodine atom per molecule and produced in smal

can

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US / kæn /

UK / kən,kæn /

A1
  • noun
  • A metal container for storing food
  • other
  • Able to; have the skill to; have the time to
  • verb
  • To have permission to
  • To be possible to do
  • To preserve food by sealing it in a metal container

neoteny

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US / nɪˈɒt(ə)ni /

UK / niːˈɑːtəni /

A1
  • other
  • An evolutionary trend to be born earlier so that development is cut off at an earlier stage and juve

experience

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US / ɪk'spɪərɪəns /

UK / ɪkˈspɪriəns /

A1
  • noun
  • Thing a person has done or that happened to them
  • An event at which you learned something
  • Knowledge gained by living life, doing new things
  • verb
  • To gain knowledge by doing things

metamorphosis

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US / ˌmetə'mɔ:fəsɪs /

UK / ˌmɛtəˈmɔrfəsɪs /

A1
  • other
  • Marked and rapid transformation of a larva into an adult that occurs in some animals; a striking cha

organ

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US / 'ɔ:ɡən /

UK / ˈɔrɡən /

B1
  • noun
  • Part of a person's body with a particular function
  • Large institution or body
  • Large wind instrument similar to a piano

development

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US / dɪ'veləpmənt /

UK / dɪˈvɛləpmənt /

A2
  • noun
  • Act or process of growing bigger or more advanced
  • A new event related to a previous event

preparation

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US / ˌprepəˈreɪʃn /

UK / ˌprɛpəˈreʃən /

A2
  • noun
  • Cream or substance applied onto the skin
  • Act of making ready for a purpose or activity

our

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US / 'aʊə(r) /

UK / aʊr /

A1
  • determiner
  • Belonging to us

not

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US / nɒt /

UK / nɑt /

A1
  • adverb
  • Word indicating the negative
  • (Used to form the negative of verbs)

reproduce

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US / ˌri:prə'dju:s /

UK / ˌriprəˈdus, -ˈdjus /

B1
  • verb
  • To make a copy of something
  • To have children/young; grow roots/new plants

textbook

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US / ˈtekstbʊk /

UK / ˈtɛkstˌbʊk /

A1
  • noun
  • A book that is used to study

whole

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US / həul /

UK / hol /

A1
  • adjecitve
  • Complete or full; all of
  • Being in a good condition
  • noun
  • Complete amount or sum; total

axolotl

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US / 'æksə'lɒtl /

UK / 'æksəˌlɒtəl /

A1
  • other
  • Larval salamander of mountain lakes of Mexico that usually lives without metamorphosing

compare

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US / kəm'peə(r) /

UK / kəmˈpɛr /

A1
  • verb
  • To consider how similar and different things are

interested

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US / ˈɪntrəstɪd /

UK / ˈɪntrɪstɪd, -tərɪstɪd, -təˌrɛstɪd /

A1
  • adjecitve
  • Having had your attention taken; curious
  • verb
  • To make someone want to know about something
  • To persuade to do, become involved with something

involve

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US / ɪn'vɒlv /

UK / ɪnˈvɑlv /

A2
  • verb
  • To have or be included as a part of something

juvenile

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US / ˈdʒu:vənaɪl /

UK / ˈdʒuvəˌnaɪl, -nəl /

B2
  • adjecitve
  • Concerning young people or children
  • Childish; immature; not behaving like an adult
  • noun
  • Someone who is young; a child

necessary

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US / 'nesəsərɪ /

UK / ˈnɛsɪˌsɛri /

A1
  • adjecitve
  • Needed or required; unavoidable

really

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US / ˈri:əli /

UK / ˈriəˌli, ˈrili /

A1
  • adverb
  • Used to stress something that is said; definitely
  • In a true or accurate manner
  • Very

study

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US / 'stʌdɪ /

UK / ˈstʌdi /

A1
  • noun
  • Room that a person studies or reads in
  • Piece of research
  • Topic or subject you research or learn about
  • verb
  • To focus on learning something usually at school

tadpole

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US / 'tædpəʊl /

UK / ˈtædˌpol /

B2
  • noun
  • Young form of a frog or toad living underwater

would

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US / wʊd /

UK / wʊd /

A1
  • other
  • Used to indicate something imagined
  • Used to ask or request something politely
  • Verb used to indicate possibility, request etc.
  • Used to indicate a preference
  • Used to indicate a reaction
  • Indicates something that occurred repeatedly
  • Used to indicate willingness or ability to do

understand

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US / ˌʌndə'stænd /

UK / ˌʌndɚˈstænd /

A1
  • verb
  • To know the meaning of language, what someone says

become

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US / bɪ'kʌm /

UK / bɪˈkʌm /

A1
  • verb
  • To begin to be; grow to be; develop into
  • To be suitable for a particular job or role

celebrity

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US / sə'lebrətɪ /

UK / səˈlɛbrɪti /

B2
  • noun
  • A (famous) entertainer known by many people

transform

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US / træns'fɔ:m /

UK / trænsˈfɔrm /

C2
  • verb
  • To change the shape completely in a good way

outro

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US / 'u:trəʊ /

UK / 'u:troʊ /

A1
  • noun
  • The concluding section of a piece of music or a radio or television program.

cute

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US / kju:t /

UK / kjut /

B2
  • adjecitve
  • Attractive in a pretty or endearing way

example

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US / ɪgˈzɑ:mpl /

UK / ɪɡˈzæmpəl /

A1
  • noun
  • Thing, person which represents a category

happen

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US / 'hæpən /

UK / ˈhæpən /

A1
  • verb
  • To take place or occur

perspective

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US / pə'spektɪv /

UK / pɚˈspɛktɪv /

B1
  • noun
  • Artistic method of creating a sense of distance
  • Ability to understand what is important in life

first

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US / fɜ:st /

UK / fɚst /

A1
  • adjecitve
  • 1st; Coming before all others in time or place
  • noun
  • Something that has not happened before
  • Position of the winner of a competition

get

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US / ɡet /

UK / ɡɛt /

A1
  • verb
  • To become affected by illness or disease
  • To begin to feel or understand an emotion or idea
  • To send or bring someone or something home, etc.
  • To go somewhere to obtain something
  • To (cause to) do a particular thing
  • To obtain, receive or be given something
  • To currently have
  • To prepare for use
  • To understand something being said or read

particularly

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US / pəˈtikjuləli /

UK / pɚˈtɪkjələli, pəˈtɪk- /

A2
  • adverb
  • Specially; more than others

cause

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US / kɔ:z /

UK / kɔz /

A2
  • noun
  • Belief, goal or organization that people support
  • Reason for
  • verb
  • To make something happen; create effect or result

during

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US / ˈdjʊərɪŋ /

UK / ˈdʊrɪŋ, ˈdjʊr- /

A1
  • preposition
  • At some point in the course of an event or thing

force

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US / fɔ:s /

UK / fɔrs, fors /

A1
  • noun
  • Group of persons trained for military action; army
  • Pressure; attraction
  • The use of physical strength/violence to persuade
  • verb
  • To use physical strength or violence to persuade

include

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US / ɪnˈklu:d /

UK / ɪnˈklud /

A1
  • verb
  • To make someone, something part of a group

generous

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US / ˈdʒenərəs /

UK / ˈdʒɛnərəs /

A2
  • adjecitve
  • Giving or ready to give freely
  • (Of an amount) larger than usual; lavish

must

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US / məst /

UK / mʌst /

A1
  • noun
  • Something that is necessary or required
  • other
  • (Used to state that something ought to be true)
  • Used to say something is required or necessary

baby

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US / ˈbeɪbi /

UK / ˈbeɪbi /

A2
  • adjecitve
  • Small in size; smaller than usual
  • noun
  • A very young child, who cannot yet speak
  • verb
  • To treat someone as if they were newly born

despite

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US / dɪˈspaɪt /

UK / dɪˈspaɪt /

A2
  • preposition
  • Without being affected by something; in spite of

growth

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US / grəʊθ /

UK / groʊθ /

A2
  • noun
  • Improvement, development in a skill over time
  • A mass on the skin or body part related to illness
  • Act of growing

essentially

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US / ɪˈsenʃəli /

UK / ɪˈsenʃəli /

A2
  • adverb
  • Basically; (said when stating the basic facts)

mexican

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US / ˈmeksɪkən /

UK / ˈmɛksɪkən /

A1
  • adjecitve
  • Concerning the culture and people of Mexico
  • noun
  • Person from Mexico

right

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US / raɪt /

UK / raɪt /

A1
  • adjecitve
  • Correct or true
  • The south side of you looking at the rising sun
  • adverb
  • Exactly in a place or time
  • Being appropriate for a particular event
  • In a straight or direct manner
  • noun
  • Something you are legally or morally allowed to do
  • Ideal of what is just and good
  • Political view based on conservatism
  • verb
  • To fix something previously wrong or unjust
  • To make upright, as a boat that has turned over

she

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US / ʃɪ /

UK / ʃi /

A1
  • pronoun
  • Female person or animal mentioned before
  • (Refers to female person mentioned before)

terrestrial

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US / tə'restrɪəl /

UK / təˈrɛstriəl /

B2
  • adjecitve
  • Concerning the earth; not of, in the air or space
  • noun
  • Person who lives on earth; not an alien
  • other
  • Concerning the earth; not of, in the air or space

case

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US / keɪs /

UK / kes /

A1
  • noun
  • Container used to carry things, e.g. clothes
  • Set of facts about a crime
  • Set of facts about an event
  • Example or instance of something
  • verb
  • To find out about a place, as in planning to steal

find

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US / faɪnd /

UK / faɪnd /

A1
  • noun
  • Object discovered by chance
  • Things that have been discovered from searching
  • verb
  • To become aware of something that is happening
  • To discover or meet by chance
  • To decide if someone is guilty of a crime, or not
  • To learn through study, research, or effort
  • To discover something by looking for it

watch

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US / wɒtʃ /

UK / wɑtʃ /

A1
  • noun
  • Period of time someone is responsible for guarding
  • Device you wear on your wrist that shows the time
  • Official warning statement, e.g. of bad weather
  • verb
  • To keep in check, manage, or control something
  • To look at something for entertainment, e.g. TV
  • To guard a place or people; protect child, etc.
  • To look at carefully to work out what is happening
  • To protect and care for someone or something

different

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US / ˈdɪfrənt /

UK / ˈdɪfrənt /

A1
  • adjecitve
  • Not of the same kind; unlike other things

even

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US / 'i:vn /

UK / ˈivən /

A1
  • adjecitve
  • Being equal in influence, power, possibility etc.
  • Being divided equally or fairly
  • (Of teams/contest) with similar chances of success
  • Smooth, level, or regular
  • Can be divided by 2; ending in 2, 4, 6, 8, or 0
  • At a regular, equally steady manner
  • Remaining steady and unchanging
  • adverb
  • (When this is surprising) as well; too
  • (Used to compare two things/stress the difference)
  • verb
  • To make something level; to flatten
  • To make something equal

like

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US / laɪk /

UK / laɪk /

A1
  • adjecitve
  • Being equal in status or kind to something else
  • Similar; the same
  • adverb
  • For example
  • preposition
  • Used as a filler; used to ad emphasis
  • In a way similar to the way something is done
  • Such as; for example
  • verb
  • To want to
  • To find something pleasing; to prefer something

salamander

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US / ˈsæləmændə(r) /

UK / ˈsæləˌmændɚ /

C1
  • noun
  • Amphibian resembling a lizard

that

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US / ðæt /

UK / ðæt, ðət /

A1
  • adjecitve
  • The person or thing being talked about
  • Used to identify something both the speakers know
  • adverb
  • Used to reinforce adjectives and adverbs
  • To such a degree
  • conjunction
  • Used to connect a noun clause
  • Used to introduce an adverbial clause
  • Used to introduce a noun clause
  • determiner
  • Used as a noun to refer to something
  • pronoun
  • Referring an object far away
  • Used to refer to the relative pronoun ‘which’

what

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US / wɒt /

UK / hwɑt, hwʌt, wɔt, wʌt,hwət, wət /

A1
  • pronoun
  • Thing or things that; the same kind as
  • Used to emphasize something you are about to say
  • adjecitve
  • Used to refer to a particular amount, or number
  • Used to place emphasis on a particular quality
  • adverb
  • To a certain degree
  • determiner
  • Question words used for asking for information
  • exclamation
  • Used to express excitement, shock, or surprise
  • Used to ask people to repeat something they said

number

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US / ˈnʌmbə(r) /

UK / ˈnʌmbɚ /

A1
  • noun
  • Symbols such as 1, 2, 56, 793
  • Particular song or dance performed during a show
  • Total quantity or amount of things
  • verb
  • To put numbers on things
  • To assign a sequence within a group, series, set
  • To claim to be part of a larger group, series, set

plasma

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US / ˈplæzmə /

UK / ˈplæzmə /

B2
  • noun
  • Substance in which the blood cells are carried
  • Gas-like substance with little electric charge

specie

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US / 'spi:ʃi: /

UK / 'spi:ʃɪ /

B1
  • noun
  • Singular of species
  • Subtitles section
  • [♪ INTRO] If you hear the word "baby-faced", you might picture a doe-eyed celebrity who never seems to age.
  • But, really, you should be thinking of the axolotl.
  • These Mexican salamanders are a textbook example of neoteny, which is a critter's ability to retain juvenile features into adulthood.
  • Basically, axolotls look like salamander larvae even after they become sexually mature.
  • And while many species, including humans, demonstrate neotenous traits, axolotls are extra weird because, with the right chemistry, scientists can force them to basically grow up in appearance.
  • By messing with hormones, it's possible to transform these otherwise forever-babies, causing them to lose their youthful glow and look like any other salamander.
  • Generally, amphibians experience metamorphosis, in which their bodies undergo dramatic changes as they develop into adults.
  • Think of a tadpole, which reabsorbs its tail and grows legs, morphing from a fully-aquatic baby into a terrestrial toad!
  • During adolescence, other species, like the tiger salamander, can look a lot like axolotls.
  • They have frilly external gills for breathing underwater and fins on their tails for swimming around.
  • During metamorphosis, they lose these aquatic features in preparation for life on land.
  • But axolotls are the Peter Pans of the amphibian world.
  • Instead of metamorphosis, they undergo paedomorphosis, retaining a number of juvenile traits while still developing into an adult capable of reproducing.
  • Some scientists think that this refusal to grow up was an evolutionary response that enabled them to exploit aquatic environments that didn't dry up seasonally.
  • If the water is worth sticking around in, they might as well just never leave.
  • But it turns out it is possible for an axolotl to metamorphosize!
  • The key: thyroid hormones.
  • These hormones are actually vital for metamorphosis in all amphibians, and we've known that for some time.
  • In the early 1900s, scientists were trying to sort out the different influences organs had on growth and development, and to learn more, they would actually feed those organs to laboratory animals.
  • And when you feed another animal's thyroid to an amphibian, it jumpstarts the metamorphosis process, suggesting there must be something in there that affects their development.
  • In 1920, a researcher first tried this out on axolotls, and found they matured into full-blown adulthood.
  • Fortunately, we've since identified the hormones involved, and can just add those to the water.
  • The main thyroid hormones at play are triiodothyronine, or T3, and thyroxine, called T4.
  • They regulate genes that drive the unique physical changes during this period of development.
  • Compared to their terrestrial relatives, axolotls have much lower thyroid hormone levels, both as juveniles and adults.
  • And they seem particularly low on T4 in their plasma.
  • But it takes multiple genes to control something as complex as hormone signaling.
  • So even though axolotls don't have much of the hormones, they've retained a lot of other necessary pieces, because they evolved from an ancestor that did fully morph.
  • Which is why scientists can, and have, induced full metamorphosis in axolotls by upping their thyroid hormone intake!
  • And it's not just external features like their gills and tail that change.
  • Even their lungs and heart transform dramatically, essentially becoming a functional terrestrial adult.
  • This might seem like a strange experiment, but it helps researchers study what's really happening during paedomorphosis and metamorphosis, both at the cellular level and from an evolutionary perspective!
  • Such a weird test case could shed some light on the influence of thyroid hormones like T4 in vertebrate brain development.
  • It could also help us understand how some animals regrow limbs.
  • Axolotls do this easily in their forever-baby state, but lose the ability when made to grow up.
  • Some scientists think that could be related to changes in their bacterial communities during metamorphosis.
  • So despite their childish lifestyles, we still have a lot to learn from axolotls!
  • Thanks for watching this episode of SciShow, and thanks to our patrons, who are not only generous but also cuter than a whole aquarium full of axolotls.
  • If you're interested in being part of what we do here, you can get started at patreon.com/scishow.
  • [♪ OUTRO]