When birds lose the ability to fly, their bodies change faster than their feathers, scientists discover
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 compared the feathers and bodies of different species of flightless birds and their closest relatives who can still fly.
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 compared the feathers and bodies of different species of flightless birds and their closest relatives who can still fly.
