3Pre-IntermediateKidsAges 9-11Science

Amazing Fossil Shows Ancient Animals Had Live Babies!

Scientists found a very old fossil in Argentina. It is 236 million years old! It shows that ancient animals had live babies, not eggs. This changes what we know about animal history.

1 min readLevel 3August 14, 2026

By Flalingo Editorial Team

Vocabulary

Study these words before reading the article. Click the audio button to hear pronunciation.

fossil

/ˈfɒsəl/

noun

The remains of a very old animal or plant found in rock

“We saw a dinosaur fossil at the museum.”

ancient

/ˈeɪnʃənt/

adjective

Very, very old; from a long time ago

“The ancient tree was over 500 years old.”

discovery

/dɪˈskʌvəri/

noun

Finding something new or learning something for the first time

“The discovery of the new planet was exciting.”

believed

/bɪˈliːvd/

verb

Thought something was true in the past

“People once believed the Earth was flat.”

exciting

/ɪkˈsaɪtɪŋ/

adjective

Making you feel very happy and full of energy

“The football game was very exciting!”

studying

/ˈstʌdiɪŋ/

verb

Looking at something carefully to learn about it

“She is studying the stars with a telescope.”

Listen to Article

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Article

Click on any underlined word to see its definition. Highlighted words are from the vocabulary section.

Scientists found an amazing fossil in Argentina! It is 236 million years old. The animal was about the size of a dog. It lived long before the dinosaurs disappeared. Scientists call this animal a cynodont. Cynodonts are the ancient family of all mammals.

For a long time, scientists believed these animals laid eggs. But this fossil tells a different story! The bones show a special growth line inside. This line appears only after a live birth. The baby was quite big when it was born.

This discovery is very exciting for scientists! It changes what we know about animal history. Live birth may be 90 million years older! Scientists will keep studying more fossils. Maybe they will find even more surprises!

Comprehension Quiz

Test your understanding of the article with these multiple-choice questions.

1
How old is the fossil in the article?
2
What did scientists believe before this discovery?
3
Where was the fossil found?
4
How big was the ancient animal?

Discussion

Answer these comprehension questions about the article.

1
Where did scientists find the fossil?
2
How old is the fossil?
3
What did scientists believe about these animals before?
4
What did the growth line in the bones show?
5
How many years older is live birth now?

Further Discussion

Share your opinions on these open-ended questions.

1
If you found a fossil, what animal would you want it to be?
2
What is your favorite thing about ancient animals?
3
Would you like to be a scientist? Why or why not?
4
Can you think of animals that lay eggs today?
5
If you could travel back in time, what would you want to see?

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