More than 99% of birds can fly. But that still leaves many species that evolved to be flightless, including penguins, ...

Birds are the only group of dinosaurs that survived the asteroid-induced mass extinction 66 million years ago. But not all the birds alive at the time made it. Why the ancestors of modern birds lived ...

It took 150 million years for feathered dinosaurs to master flight and become the birds we see overhead today. By 125 million years ago, the Mesozoic skies were full of birds. But many of them were ...