Arizonasaurus was an archosaur from the Middle Triassic. Dinosaurs evolved from a group of reptiles called archosaurs (“ruling reptiles”) around 240–250 million years ago. This was during the Triassic ...

Long before dinosaurs became dominant, the Triassic world was ruled by archosaurs whose true behavior is still debated by ...

The mass extinction that wiped out nearly all life on Earth just before the dinosaurs evolved may have been caused by a global temperature drop rather than a rapidly warming climate. The End Triassic ...

WASHINGTON (Reuters) - Dinosaurs long dominated Earth's land ecosystems with a multitude of forms including plant-eating giants like Argentinosaurus, meat-eating brutes like Tyrannosaurus and weirdos ...

In Paraíso do Sul in southern Brazil, scientists discovered a fossil of a dog-sized reptile dating back to 237 million years ago. The creature, a newly described species named Gondwanax paraisensis, ...

Researchers have conducted what could be the largest study ever of dinosaur poop. The findings shed new light on how dinosaur's diets allowed them to dominate the planet. The analysis of hundreds of ...

Despite Earth's most devastating mass extinction wiping out over 80% of marine life and half of land species, a group of early reptiles called archosauromorphs not only survived but thrived, venturing ...

About 200 million years ago, the earliest dinosaurs had a lot of reptilian company. There were big crocodile-like creatures, ponderous plant-eaters, even four-legged runners with fierce, ...

Add Yahoo as a preferred source to see more of our stories on Google. Where they lived: Dinosaur fossils have been found on every continent, including Antarctica. What they ate: Some ate plants, while ...

Switzerland, A Paradise For Dinosaur Hunters. Or Is It?. Switzerland occupies a special place in the world of ichnology, the ...