Laugh and learn with fun facts about prehistoric mammals including saber-toothed cats, dire wolves, giant horses, Stone Age humans, and more--all told in Dr. Seuss's beloved rhyming style and starring the Cat in the Hat! "I'm the Cat in the Hat. Oh, please turn the page to discover some mammals from the Great Ice Age!" The Cat in the Hat's Learning Library series combines beloved characters, engaging rhymes, and Seussian illustrations to introduce children to non-fiction topics from the real world! Travel back in time and learn: * the difference between mammoths and mastodons * how giant sloths grew as big as elephants * how we study fossils to guess how animals looked and behaved * and much more! Perfect for story time and for the youngest readers, Once upon a Mastodon: All About Prehistoric Mammals also includes an index, glossary, and suggestions for further learning. Look for more books in the Cat in the Hat's Learning Library series! If I Ran the Horse Show: All About Horses Clam-I-Am! All About the Beach Miles and Miles of Reptiles: All About Reptiles A Whale of a Tale! All About Porpoises, Dolphins, and Whales Safari, So Good! All About African Wildlife There's a Map on My Lap! All About Maps Oh, the Lavas That Flow! All About Volcanoes Out of Sight Till Tonight! All About Nocturnal Animals What Cat Is That? All About Cats Oh Say Can You Say What's the Weather Today? All About Weather The Cat on the Mat: All About Mindfulness.