More than 99% of birds can fly. But that still leaves many species that evolved to be flightless, including penguins, ostriches, and kiwi birds. In a study in the journal Evolution, researchers ...

Collisions between birds and window panes are a frighteningly common tragedy. Every year in the U.S. alone, over 1 billion birds die from crashing into buildings. That's according to a 2024 study ...

Researchers examined dozens of bird species in museum collections looking for differences in the feathers and bodies between birds that can fly and birds that can't. They found that when birds evolve ...