Research looks at the evolutionary pathways to differences in bird plumage patterns between males and females -- and concludes that birds are able to adapt their appearance with remarkable ease.

When you first see Shaun Kardinal’s amazing bird photos, you wonder just what's going on. His images show birds flying in complex patterns---squares, spirals, even circles---you’ve never seen before, ...

Larger-bodied migratory birds are reproducing less, while sedentary species of small-bodied birds tend to produce more offspring under similar conditions, according to an international study focused ...