Researchers discovered that a 215-million-year-old reptile started life on four legs and switched to two as an adult.

If you thought that crocodiles were menacing enough, be glad that you didn’t live in Arizona some 225–201 million years ...

He also noted that features such as bipedalism, toothless beaks, hollow bones, and large eye sockets are typically associated ...

A remarkable fossil discovery in India is giving scientists new clues about how some dinosaurs reproduced. Researchers have ...

Paleontologists have often determined how old a dinosaur was by counting the growth rings in its bones. Just like with trees, ...

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

Learn how fossils from Arizona’s Petrified Forest National Park revealed that a Late Triassic crocodile relative may have started life on four legs before walking on two as an adult.

Roughly 425 million years ago, in the warm seas over what is now southern China, there lived a meter-long bony fish with jaws ...