Euparkeria

Euparkeria was a strange, early archosauromorph that lived in the Middle Triassic; it's main claim to fame was that its hind legs were considerably longer than its front legs, suggesting at least partial bipedalism. Its limbs were not fully erect, meaning that when it did go about on two legs, it did so in the manner of a crocodilian "high walk". In Walking With Monsters, Euparkeria was erroneously described as the "ancestor of dinosaurs"; in reality, Euparkeria was closer to the base of the archosaurian tree, making it ancestral to not only dinosaurs, but pterosaurs and crocodilians as well. This misconception came from its bipedalism, which was more likely to be an independent adaptation, rather than a basal one.