The great potoo, a nocturnal bird native to Central and South America, is known for its exceptional camouflage and eerie ...

From the sharp, hooked beak of a hawk to the delicate, nectar-sipping bill of a hummingbird, every shape tells a story of adaptation and ... and type of seeds the bird consumes.

So the adaptation to a changed environment led to a larger-beaked finch population in the following generation. Adaptation can go either way, of course. As the Grants later found, unusually rainy ...

The different finch species on the islands are closely related to each other, but show wide variations in beak and body size and feeding behaviour. In particular, changes to the size and shape of the ...