Before the arrival of mammals and dinosaurs, reptiles and amphibians dominated the landscape. But due to climate changes during the Triassic period, mammals and dinosaurs began to flourish. Learn more on the Science Channel's "Mammals vs Dinos."
WHAT'S INSIDE: EXTINCT ANIMALS
- Extinct Birds
- Prehistoric Animals
- Other Extinct Animals
Often called the terror of the Early Jurassic, the Dilophosaurus was a fast and agile dinosaur with extremely powerful neck and jaw muscles. It also had two crests on its head that may have been used for displaying the animal's social position.
Named after the flying mythical Greek creatures called Harpies that snatched victims with their hands, Harpymimus ("snatcher mimic") is the most primitive ornithomimid known. Learn more about the Harpymimus and other Late Cretaceous dinosaurs.