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 ...

Dinosaurs evolved from a group of reptiles called archosaurs (“ruling reptiles”) around 240–250 million years ago. This was during the Triassic period. This branch of the tree of life gave rise to ...

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 ...

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, ...

Where they lived: Dinosaur fossils have been found on every continent, including Antarctica. What they ate: Some ate plants, while others ate animals, including other dinosaurs. How big they were: The ...

Archosauromorphs walked - across a 10,000-mile hellscape - so dinosaurs could run. According to a new study published in Nature Ecology and Evolution, archosauromorphs, early ancestors of dinosaurs ...

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 ...

A fossil site of "unique importance" has shed light on a lost prehistoric ecosystem where early dinosaurs roamed more than 200 million years ago. For a study published in the Proceedings of the ...

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 ...