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From the publishers of Premier Issue TM © 2017 Wildlife Education, Ltd.® All rights Please visit reserved. No part of this publication may be reproduced or transmitted in any form zoobooks.com or by any means, electronic or mechanical, including photocopy, recording, or any for upcoming information storage or retrieval system, without permission in writing from the Zoodinos titles, publisher. plus all our Published by Zoobooks® Wildlife Education, Ltd. www.zoobooks.com titles from TM Alligators to Zebras. by Justin Dial Ouch! Too bad you’re not TYRANNOSAURUSTYRANNOSAURUS REXREX an adult T. rex. Home This is one tough nut! Sweet Home Page 8 Be careful, Terry. Don’t break your beak! With teeth like that, this nut would be no problem! Did you know Did T. rex Roar? T. rex can bite with enough pressure to Well, shatter bones? there is still Page 11 one problem. Finding a Address Changes: brave dentist! Please include old and new addresses and ZIP Codes. Enclose address label from last issue and allow six to eight weeks for change to become effective. Contact Customer Service at: www.Zoobooks.com From time to time, Zootles Wow! mails to its subscribers advertisements for other Zoodinos products or makes its subscriber list available to other reputable companies Nut? for their offering of products and services. If you prefer not to receive such mail, write to us at Zoobooks PO Box 6322, Harlan, IA 51593. Printed by R.R. Donnelley in Pontiac, Illinois, September 2016. Printed in U.S.A. www.zoobooks.com/eZoobooks Enjoy on Tablets & Web! Download This Book Now Stomp, Stomp, Growl, Chomp! These big-toothed dinosaurs loved to romp. illustration by Phil Wilson yrannosaurus (TY-ran-uh-sor-us) rex was a T dinosaur that lived over 65 million years ago! It was part of a group of dinosaurs called theropods (THER-uh-pods). T. rex was also a carnivore, which means it ate meat. Other dinosaurs turned the other way when they saw T. rex nearby—these large theropods were big, fast, and had a royally bad bite! A Tooth Like a Spike! T. rex teeth were strong, sharp, and meant for gripping and ripping. They could even be replaced when they fell out or broke off. What big teeth we had! 1 Take a Look at T. rex! If you saw T. rex today... illustration by Phil Wilson It would stand about as tall was a top predator, meaning it was a Nose as a giraffe. T. rex master hunter nobody messed with. T. rex had a good sense of smell for Its eyes and nose helped it find food, and it used its Eyes finding food, alive strong legs and sharp teeth to ambush and catch its prey. With two eyes in or dead. Head front, T. rex could T. rex had a huge head, judge the distance which means it also had to its prey. a huge bite! Feathers T. rex most likely had feathers on its body. Adults probably didn’t need them, but the feathers could have helped T. rex chicks stay warm. It would be about as long as a bus from head to tail. Teeth T. rex teeth were It would weigh about Legs sharp and strong, like railroad spikes. as much as an T. rex was no sprinter, Don’t forget the tail! but it could run up to African elephant. A T. rex tail didn’t bend or whip 20 miles an hour when chasing down food. Arms around. It was there for balance. T. rex had little arms Without it, T. rex would have that were probably fallen down a lot because of its not very useful. But huge, heavy head! its big teeth more Feet than made up for the T. rex had toes with scrawny arms. sharp claws on them. 2 illustration by Michael Welply illustration by Michael Welply 3 Meet Some theropods, like Microraptor, were only Theropods! about the size of a crow. the illustration by Phil Wilson ixty-five million years ago, the dinosaurs died out— Sexcept for one group. Some small dinosaurs are still alive today: birds. My wings don’t Birds are the last remaining members of the theropod have feathers, but I can fly. group, the group that included Tyrannosaurus rex. While a chicken might not look much like T. rex, they have a lot in common. Both have two legs; light, air-filled bones; and feet with Like T. rex, many theropods ate meat, but some ate plants. Therizinosaurs three toes pointing forward. These are traits that most (THER-uh-ZEE-no-sors) used their theropods share. Theropod dinosaurs even had feathers! huge claws to tear down leafy tree However, large theropods like T. rex could not fly. branches to eat. Giant theropods like Spinosaurus (SPY-no-sor-us) were longer than a school bus from snout to tail. 4 5 Teeth Myby Mary McCoy Teethillustration by Michael Welply My teeth are as big as bananas, They are sharper and better than knives. They grind and they gnaw When I snap my large jaw, Which is handy when lunchtime arrives. A komodo dragon has teeth much like T. rex did. The teeth have edges on them that help with My teeth are as sturdy as oak trees. gripping and ripping! Komodo My teeth, they are stronger than steel. dragons, like dinosaurs, They chomp and they chew, can also replace teeth And they know what to do, that fall out. When my stomach says, “Time for a meal!” My teeth work as hard as an engine, My teeth are as busy as bees. And if a tooth should fall out While I’m stuffing my snout, That’s a T. rex It’s fine—I grow new ones with ease! tooth— see the pointy edges? 6 7 Overall, Earth was much warmer and more humid. In the places where T. rex lived, a winter day would seem like the middle of summer! Many dinosaurs Home Sweetillustration by Kayla Harren Home thrived in these warm temperatures. hen T. rex was alive, Earth looked very different. There were no people Wor buildings, and some of the plants and animals that were familiar to T. rex would look almost alien to us. T. rex lived in areas near water sources, such as rivers or swamps. These places would attract animals that T. rex would hunt, such as Triceratops (Try-SER-uh-tops). Flowers had evolved by the time of T. rex, along with trees and ferns. MESOZOIC ERA 227–66 million years ago Triassic Period Jurassic Period Cretaceous Period Early Middle Late Early 100million Late 227million 205 million 180 million 159 million 145million 66 million years ago years ago years ago years ago years ago years ago years ago T. rex lived during the Late Cretaceous (cruh-TAY-shus) period. Dinosaurs were on Earth for But different This period of time lasted for nearly 50 million years! Many millions of years. kinds lived different dinosaurs roamed the Earth back then. However, at at different the end of the Cretaceous period, all the dinosaurs except for times. some theropods died out. Today’s theropods, though, are tiny in comparison and nowhere near as fierce! 8 9 How Did T. rex Behave? illustration by Phil Wilson inosaurs’ lives are a mystery. Their remains, called Saying “hello” Dfossils, can’t tell us exactly how they acted or what their families were like. However, looking at T. rex’s fossils and comparing them with animals that are alive today can help scientists guess what T. rex’s life might have been like. Ostriches make nests with a mound of eggs. While no T. rex eggs have been discovered yet, other theropod egg discoveries show similar kinds of behavior. Lions use their noses to track prey and to scavenge. T. rex likely did the same, even though its sense of smell was not as good as a lion’s. In the movies, the roar of T. rex sends everything else running. But T. rex likely didn't roar like a lion. Instead, it probably hissed like a crocodile. The Bearded Vulture eats meat and bones, Crocodilians use their strong jaws and strong leaving nothing to necks to rip away chunks of meat. T. rex waste. Bone shards probably did this, too. found in T. rex droppings suggest these dinosaurs would also feast Do you see any lions? on a femur. No. No crocs either. 10 11 Hungry Tara by Wendy Zamora illustration by Kayla Harren ara’s stomach rumbles.The big T. rex stalks through Tthe forest, looking for food. She will lay her eggs soon, but first she needs to eat. Tara walks, feeling the warm sun on her back and watching the leaves of the nearby trees move in the breeze. But her part of the forest is quiet this morning. Her sharp eyes do not see any prey to chase. Suddenly, Tara catches the scent of a young Triceratops. It is close! Her stomach rumbles again, fiercely. Tara quickly follows the smell. Tara bursts into a clearing ready to surprise the Triceratops. But this horned dinosaur is not alone! Three big dinosaurs face Tara. They shake their heads, showing off their spiked, bony frills. Tara hisses at them, but she backs away. She knows she is outnumbered. Tara heads back into the dense forest. She walks past trees upon trees. She splashes through swamps. Small reptiles scatter under her feet. A gigantic Queztalcoatlus (KET-sil-ko-wat-lus) flies over her head. But there is nothing to eat. 12 13 Tara bends over the dinosaur body, baring her enormous teeth.