Researchers believe these creatures started out on four legs and later began walking on two legs as they grew.

Fossils reveal a small ancient reptile related to crocodiles, Sonselasuchus cedrus, that may have switched from four legs to ...

In zoology, the term “bipedal” refers to animals that use only two legs for walking. There are several groups of modern species considered habitual bipeds, meaning two-legged walking is their normal ...

Scientists discovered a crocodile relative that is 200 million years old and had two legs. The diversity of reptiles during ...