Brain sleep appeared early in vertebrate evolution. Researchers describe the existence of REM and slow-wave sleep in the Australian dragon, with many common features with mammalian sleep: a phase...

A new study reveals that tiny fossil ancestors of modern horses may have moved quite differently to their living counterparts.

Multiple dispersals of penguins reached Australia after the continent split from Antarctica, including 'giant penguins' that may have lived there after they went extinct elsewhere, according to a new...

Long-necked sauropod dinosaurs include the largest animals ever to walk on land, but they hatched from eggs no bigger than a soccer ball.

Scientists have discovered Sarmientosaurus musacchioi, a new species of titanosaurian dinosaur, based on an complete skull and partial neck fossil unearthed in Patagonia, Argentina, according to a...

Researchers have uncovered dozens of fossilized teeth in Kuwajima, Japan, and identified this as a new species of tritylodontid, an animal family that links the evolution of mammals from reptiles....

Researchers have used 'network theory' for the first time to visually depict the movement of dinosaurs around the world during the Mesozoic Era -- including a curious exodus from Europe.

New research based on high-resolution x-ray movies reveals that despite having extremely underdeveloped muscles and wings, young birds acquire a mature flight stroke early in their development,...