The world's largest bird — a newly identified species of elephant bird — weighed as much as a dinosaur when it strutted around Madagascar more than 1,000 years ago, a new study finds.

A remarkable new fossil of the largest "four-winged" flying dinosaur with dramatic long feathers reveals a design more like a plane than a bird, a team of scientists says.

As dinosaurs evolved toward birds, he said, they got smaller and smaller, their fossils show. Until now, bird-like dinosaurs were at most 10 or 11 feet long -- certainly not 26 feet, he said ...

It had some of the proportionally largest pupils ever measured in either birds or dinosaurs. “For many decades, dinosaurs were considered to be day-active,” study co-author Lars Schmitz, a ...

We’ve still got avian dinosaurs – birds – but all of their awesome relatives died out in a geological instant 66 million years ago. Paleontologists still don’t know why.

Sauropod eggs were cantaloupe- to basketball-sized, smaller than those of the biggest birds. Even a 100-foot-long sauropod started out life just a foot or two long.