“Ankle bones of Purgatorius exhibit features that indicate it lived in trees, so we initially thought its absence south of Montana could be related to the sweeping devastation of forests from the ...

How a collection of London pigeons and Galápagos mockingbirds provided the receipts for Darwin’s biggest ideas.

Three tiny Purgatorius teeth found in Colorado are helping scientists trace how early primates evolved and spread across North America.

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

A fossil skull barely 1 inch long has proved to be a newborn reptile from Brazil’s Late Triassic, a period more than 230 million years ago when early reptiles dominated land ecosystems. Its tiny jaw ...

The Spinosaurus is a sail-backed, crocodile-snouted dinosaur that Hollywood depicted as a giant terrestrial predator capable of taking down a T. rex in Jurassic Park 3. Then they changed their mind ...

These newly discovered crocodyliform eggs suggest a shift toward semi-aquatic lifestyles and humid nesting sites.

Scientists long believed stem tetrapods largely disappeared after a major ecological event known as the Carboniferous Rainforest Collapse. That event caused widespread destruction of tropical forests ...