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 ...

Although it’s commonly suspected that migratory birds fly in a ‘V’ formation due to this saving energy for the birds in the ...

Scientists have known for years that birds like geese and ibises gain an aerodynamic advantage from flying in a "V" formation ...

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 ...