How 'Parrot Dinosaur' Switched from Four Feet to Two as It Grew. Psittacosaurus, the 'parrot dinosaur' is known from more than 1000 specimens from the Cretaceous, 100 million years ago, of china and other parts of east Asia.
This is a real dinosaur fossil found in Wyoming in It has been identified as a young Pachycephalosaurus. As the dinosaur ages the spikes on the head smooth out. If this is not a dead on land dragon there simply is not one.
Protoceratops is a genus of sheep-sized herbivorous ceratopsian dinosaur, from the Upper Cretaceous Period of what is now Mongolia. It was a member of the Protoceratopsidae, a group of early horned dinosaurs.
Amargasaurus, a Sauropod dinosaur from the early Cretaceous Period (around 130 million years ago). Amargasaurus was small for a Sauropod and featured two rows of spines down its neck and back. Photo taken in Victoria Museum, Melbourne, Australia.