The new species unearthed in Patagonia belongs to a group called abelisaurids, which resembled tyrannosaurs with short, bumpy faces.
Finding suggests "megapredators" may have been more common in Mesozoic Era than previously thought.
Prehistoric remains also reveal signs of a particularly large predator.
Long legs didn't make the massive predators faster but helped save energy during the daily grind, new research suggests.
Fossil shows that miniature dinosaurs likely shared the earth with giants during the Mesozoic Era.
Corral Bluffs location contains fossils from a critical time in the evolution of mammals.
New study reveals how baby hoatzin birds are able to move like four-legged animals, thanks to unique claws on their wings.
Two well-preserved fossils found in China were covered in both furlike pycnofibers and featherlike features.
The smallest Diplodocus skull ever discovered reveals clues about the group's evolution.
Deep water reptiles diversified as Mesozoic sea levels rose. Their shallow water counterparts declined.