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

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 ...

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

Sonselasuchus cedrus, discovered in fossils from Arizona, was a crocodile relative from the Triassic period that grew into an ...

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 ...

Scientists discovered some of the oldest bony fish fossils in China. The fossils explain the early history of animals with backbones.

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

TÜBINGEN, GERMANY—According to a statement released by the University of Tübingen, an international team of researchers who evaluated a fossil femur unearthed at the site of Azmaka in southern ...