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The Cat in the Hat's Learning Library

Once Upon a Mastodon(Hardback) - 2014 Edition

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How cool! The Cat and Co. time-travel to the Great Ice Age! The Cat in the Hat visits with Ice Age mammals on a whirlwind tour of the Pleistocene! From ground sloths as big as elephants to bears as heavy as Volkswagens, the Cat introduces young readers to mastodons, mammoths, woolly rhinos, saber-toothed cats, giant horses, and lots more—including humans! In addition, young readers will learn basic facts about the Great Ice Age and early human life, the characteristics of mammals, and the study of fossils. Ideal for supporting the Common Core State Standards and a natural for fans of the hit PBS Kids show The Cat in the Hat Knows a Lot About That!, this is a great way to introduce beginning readers to science!

Unknown Binding

First published September 1, 2014

2 people are currently reading
53 people want to read

About the author

Bonnie Worth

134 books24 followers
BONNIE WORTH is the author of countless books for young readers, among them the Cat in the Hat Learning Library books If I Ran the Rain Forest, HarK! A Shark!, Oh Say Can You Seed? (winner of the 2003 Ohio Farm Bureau Award), Wish for a Fish, Oh Say Can You Say Di-No-Saur?, Would You Rather Be a Pollywog?, Ice Is Nice!, and Safari, So Good!

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Community Reviews

5 stars
28 (35%)
4 stars
27 (33%)
3 stars
18 (22%)
2 stars
6 (7%)
1 star
1 (1%)
Displaying 1 - 10 of 10 reviews
Profile Image for Tracey.
520 reviews16 followers
February 25, 2018
I really love the 'Cat in the Hat's Learning Library' books, but this one was utter garbage and I did not like it Sam I am. It is supposed to be about prehistoric mammals - but seriously it was boring as hell. It seemed as though that there was more to the animals mentions, and that is was just heavily edited. The illustrations were excellent - hence the 2 stars.
Profile Image for Villain E.
3,981 reviews19 followers
March 22, 2023
A rhyming educational book about prehistoric mammals, including humans. My kids found it fascinating. But if your kids are sensitive about the fact that animals had to die to become fossils, this isn't the book for them.
Profile Image for Lauren.
1,003 reviews
June 8, 2025
Interesting book about prehistoric times (mostly ice age) that incorporated Dr. Seuss type rhymes. It was definitely wordy and lengthy, a bit too long for a 4 year old. However, we learned some fun facts and the illustrations were nice as well. Overall, 3/5 stars ⭐️
Profile Image for Wade.
750 reviews26 followers
March 20, 2019
Decent. Clearly Bonnie Worth is no Dr. Seuss as the rhymes weren’t great. Some of the information is not correct so I skipped over. But there are some decent facts here and there.
Author 0 books1 follower
April 25, 2023
You'll appreciate reading this book and learning interesting facts before going to a Natural History Museum!
Profile Image for Ribbon.
453 reviews17 followers
November 8, 2016
Most ancient creatures books stick to dinosaurs but not this one! Once Upon A Mastodon teaches about prehistoric mammals, with awesome art and typical Seussian rhyme. There's some tricky words to read aloud but the rhymes don't hinge on getting them right most of the time, so you've got some wiggle room.
Displaying 1 - 10 of 10 reviews

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