Early Animal Encyclopedias: Dinosaurs

Early Animal Encyclopedias: Dinosaurs — page 5 — 8 AMARGASAURUS AMARGASAURUS Range Amargasaurus lived during the Early Cretaceous Period It roamed in the forests of what is now South America Only one fossil of this dinosaur has ever been found Appearance This plant-eater had two rows of long spines along its neck It was smaller than most of its sauropod cousins Its neck was shorter too But it was still a huge animal Triassic Period 252 million years ago When Did This Dinosaur Live Jurassic Period 201 million years ago Length E 39 feet 12 m Weight 9.9 tons 9 metric tons 145 million years ago Cretaceous Period 66 million years ago

Early Animal Encyclopedias: Dinosaurs — page 6 — 9 Amargasaurus fossil Mysterious Spines Amargasaurus's spines puzzle dinosaur scientists They do not know what exactly the spines did The spines may have held up flaps of skin that looked like sails Or perhaps the dinosaur rattled the spines to make noise The sails or spines could have helped attract mates Or maybe they scared away predators

Early Animal Encyclopedias: Dinosaurs — page 7 — ANCHIORNIS ANCHIORNIS Tiny Dino Anchiornis was first discovered in China in 2009. This dinosaur lived during the Late Jurassic Period It is one of the smallest lightest dinosaurs ever found 10 Length 1.3 feet 0.4 m Appearance Anchiornis was the same size as a chicken and had feathers But unlike a chicken Anchiornis had four wings Feathers sprouted from both its arms and legs In Anchiornis fossils these feathers have lost their original colors But scientists studied them carefully They took samples from a fossil They compared the samples to modern birds The scientists were Weight 8.8 ounces 250 g

Early Animal Encyclopedias: Dinosaurs — page 8 — able to figure out the color of the dinosaur Anchiornis was black and white with a red crest Climbing and Gliding Most likely Anchiornis could not fly It probably climbed trees with its claws and glided around It hunted lizards fish and other small animals When Did This Dinosaur Live Triassic Period 252 million years ago Anchiornis fossil Jurassic Period Cretaceous Period 66 million years ago 201 million years ago 145 million years ago 11

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