Mourning doves’ population is dropping, while white-wings are increasing their territory. Both species engage in wing raising to intimidate other birds eating at feeders. ( iStock ) Mourning ...

Prominent black crescent framing lower edge of auricular. On perched bird, wing patch shows only as a thin white line along the leading edge of the folded wing. Adult male: grayish or grayish ...

As it hovers in front of a flower or feeder, a hummingbird gets lift not only from the down stroke of its wings but also the up stroke. This is similar to the lift generated by insect wings, but ...

Researchers may have just found the answer: Unlike birds, the evolution of bats' wings and legs is tightly coupled, which may have prevented them from filling as many ecological niches as birds.

Directional Velcro' on birds' feathers prevent gaps from forming ... caused its feathers to fall into place. PigeonBot's wings are white because the feathers were gathered from food-grade pigeons ...

It had feathered wings like living birds, but also had traits found in reptiles, such as teeth, claws and a long bony tail. Charles Darwin, who had published “On the Origin of Species” two ...