Page "Bipedalism" Paragraph 15

Birds are bipedal when not flying.

All dinosaurs are believed to be descended from a fully bipedal ancestor, perhaps similar to Eoraptor.

Bipedal movement also re-evolved in a number of other dinosaur lineages such as the iguanodons.

Some extinct members of the crocodilian line, a sister group to the dinosaurs and birds, also evolved bipedal forms-a crocodile relative from the triassic, Effigia okeeffeae, is believed to be bipedal.

Pterosaurs were previously thought to have been bipedal, but recent trackways have all shown quadrupedal locomotion.