A newly described Patagonian fossil reveals the evolutionary origins and global spread of the tiny alvarezsaur dinosaurs.

Scientists discovered a bizarre 275-million-year-old aquatic animal with sideways teeth and a twisted jaw in Brazil, revealing a rare “living fossil” lineage from the Permian period.

The peculiar Cambrian object known as Brooksella, studied for more than a century, may never have been a fossil at all. New research suggests it could simply be a very unusual rock formed by natural ...

A strange little snake fossil found on England’s south coast has finally revealed its secrets—more than 40 years after it was discovered. The newly named Paradoxophidion richardoweni lived around 37 ...