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

The new Argentine dino might give us clues to what the world was like before the asteroid wiped out their kind.

While researchers knew the 1.5-meter-long (about 5-foot-long) slab was around 200 million years old and home to an abundance of visible dinosaur footprints, the significance of the fossil remained ...

The dinosaur’s “slender” body was evident ... Patagonia is a geographic region in southern Argentina and Chile, covering the entirety of the southern tip of South America.