Fossils of alvarezsaurid dinosaurs show bird-like air sacs in their bones. Scans revealed hollow spaces connected to their ...

A bizarre two-clawed dinosaur found in Mongolia reveals rare claw preservation and offers new insight into therizinosaur ...

An international team has just identified a new species of therizinosaur with impressive claws. Its exceptionally ...

Millions of years later, fossilized remains are now revealing the story of a giant, clawed dinosaur that once dominated the ...

Still, many known theropods had big legs, short arms, and stout, long tails—hardly the anatomy one would expect on a creature leaping from trees. Other paleontologists argued that birds did not ...

This unique anatomy inspired its scientific name, named Duonychus tsogtbaatari ... is now Asia and North America during the ...