The Triassic and Early Jurassic periods were the time periods in which dinosaurs first appeared. Learn more about the Triassic and Early Jurassic dinosaurs, such as the Lufengosaurus, Massospondylus, and Scutellosaurus.
The Herrerasaurus was a large dinosaur that weighed about 400 pounds and was about 10 feet long. It survived on a diet of small animals which it most likely caught by ambush and surprise. What else is known about this dinosaur?