Describes various prehistoric sea creatures that lived at the same time as the dinosaurs, including the placodus, mosasaurus, and plesiosaurus.

Detailed color illustrations an informative text provide readers with facts about dinosaurs.

Living fossils, or modern-day animals that very closely resemble their ancient relatives. Meet the coelacanth, horseshoe crab, dragonfly, tuatara, nautilus, and Hula painted frog. All are living fossils. Why have they changed so little over time, while other animals evolved or went extinct? Using contrasting "then" and "now" illustrations, veteran nonfiction writer Caroline Arnold alternates between a prehistoric creature in its native environment...

"Not every prehistoric creature is a dinosaur! Long, long ago, many strange beasts roamed the Earth, and this delightful picture book, based on the fossil halls at the American Museum of Natural History, tells their story. Fun, fact-filled verses introduce 16 animals (including eleven non-dinosaurs), creating a guessing game about who the subject might be."--Provided by publisher.