If birds left tracks in the sky, what would they look like ... so must a pattern form in the wake of a flying bird. But of course birds in flight leave no trace—at least none visible to the ...

Thousands of birds staged a fascinating aerial show in Dongying, China, forming the silhouette of a giant dolphin and then a snake in the sky. Scientists detect 'alien' signal from distant galaxy ...

Flightless species of birds (such as ostriches, which are the largest living birds) tend to outsize any of the largest birds ...