A 13-million-year-old leg bone from an enormous flightless bird carries crocodilian tooth marks, showing South America was ...

A 500-million-year-old sea creature called Mollisonia shared a similar brain structure to modern spiders, suggesting that ...

A remarkable finding has surfaced in the colorful, fossil-rich badlands of Arizona’s Petrified Forest National Park: North America’s oldest known pterosaur. The newly identified species — a flying ...

A 225-million-year-old leg bone from Zambia is helping scientists rethink the size, diversity, and role of early dinosaurs.

A fossilized leg bone found in Africa is reshaping our ideas about the size of the first dinosaurs. The 225-million-year-old bone belonged to a mysterious reptile group called silesaurs, which lived ...

A newly uncovered 225-million-year-old fossil challenges everything we knew about early dinosaurs.

A prehistoric carbon spike turned oceans deadly and wiped out marine life. Scientists say today’s CO₂ rise could cause the ...

Smithsonian researchers have linked discoveries within Arizona’s Petrified Forest National Park with a previously unknown ...