THE DINOSAURS For millions of years creatures known as dinosaurs roamed freely on Earth Dinosaurs lived more than 220 million years ago Dicraeosaurus Length up to 65 feet 20 m 4
5 For a long time scientists thought that dinosaurs were a type of reptile However reptiles are cold-blooded and scientists now think that dinosaurs were warm-blooded This makes them more like mammals IT’S AMAZING There were more than 1,000 different types of dinosaurs Not all of them were enormous Some such as the compsognathus were the same size as chickens Compsognathus Length up to 2 feet 65 cm Stegosaurus Length up to 30 feet 9 m
