By Katie Marsico,Reginald Butler
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But here the similarity ends. What kind of ostrich has scaly skin, a long tail, and two short arms? 41 THE END OF DINOSAURS W hat happened to dinosaurs toward the end of the Cretaceous period? Three-fourths of all dinosaurs died out. In the last 10 million years of the Cretaceous, nearly three out of every four kinds of dinosaurs disappeared. By the end of the Cretaceous, 65 million years ago, the dinosaurs were practically all gone. They had become extinct. Why did the dinosaurs become extinct?
The 2-foot-deep (60 cm) and 7-foot-wide (2 m) nests held smashed bits of eggshell. This told scientists that the young stayed in the nest for a long time. Most likely the parents fed them by mouth—just like baby birds are fed—until they were strong enough to leave the nest. Around the nests were fossils of 15 young Maiasaura, ranging in size from 3 to 15 feet (1 to 5 m). Some paleontologists think the family cared for the young until they were nearly grown. Did any plant eaters chew their food?
Dinosaurs are gone forever. No animal that became extinct has ever returned. This leaves us with two thoughts. One is to work to save the many living animals and plants that are in danger of becoming extinct today. Don’t let the tiger, elephant, and blue whale go the way of the dinosaurs. The other is to be thankful that the dinosaurs once graced our planet. They are a glorious and exciting part of our past. 46 Index Allosaurus 26, 28 Ankylosaurus 30, 31 Apatosaurus 24, 25, 28 Archaeopteryx 44, 45 asteroid 42, 43, 44, 45 Brachiosaurus 22-23 Brontosaurus 24 Carcharodontosaurus 38 claws 18, 38, 41 Compsognathus 21 Cretaceous 21,30, 34, 43, 45 Deinonychus 40 Dinosauria 12 Diplodocus 27 Edmontosaurus 12, 34, 36 eggs 16, 17 Eoraptor 19 Euoplocephalus 33 extinction 43, 46 food 7, 22, 27 fossils 7, 8, 9, 10, 12, 46 Giganotosaurus 38 Hadrosaurs 34 Herrerasaurus 12, 18-19 horns 32 Ichthyosaurs 15 Iguanodon 10-11 Jurassic 20-21, 28 Kentrosaurus 26, 27 life span 17 Maiasaura 34, 35 Mamenchisaurus 24 meat eater 7, 8, 37, 38, 41 Mesozoic 5, 18, 21, 30 Mononykus 45 Oviraptor 16, 17 paleontologists 6, 7, 17, 46 Parasaurolophus 36 plant eater 7, 8, 34, 37 plates 28, 29 protection 27, 30, 31 Protoceratops 17 Saichania 30 Seismosaurus 27 size 7, 20, 21, 22, 27, 38 sounds 36, 41 speed 8, 30, 40 spikes 27, 31 Spinosaurus 12, 13, 37 Stegosaurus 28, 29, 37 Struthiomimus 41 Supersaurus 27 teeth 7, 23, 27, 34, 38 Torosaurus 33 Triassic 18, 19, 20 Triceratops 32, 33 Troödon 41 Tuojiangosaurus 28 Tyrannosaurus 5,12, 30, 38, 39 Page numbers in bold indicate illustrations.