A tiny, overlooked wrist bone called the pisiform may have played a pivotal role in bird flight and it turns out it evolved ...

New fossil scans reveal that a tiny wrist bone in "Citipati" dinosaurs may have set the stage for the evolution of bird ...

As winter weather comes down from the north, bringing with it ice along the Mississippi River, eagles, trumpeter swans, and other birds travel flight paths to the delight of area birders. Photos ...

Many birds fly, but some, like penguins and ostriches, don't, revealing an evolutionary twist. Flightless birds adapted to ...