Early dinosaurs

The early dinosaurs are the first members of the group, and relatives whose place in the family tree is still uncertain. Most lived in the Late Triassic, when dinosaurs were still a small part of life on land.

Many come from Argentina and Brazil, where some of the oldest dinosaur-bearing rocks hold Herrerasaurus and Staurikosaurus. They were two-legged and lightly built, and most were probably hunters.