A bird beak is the most important resource it has, and every species has one solely designed for survival. Birds use beaks for just about everything: building nests, feeding their young ...

Their beaks are pale yellow with a black outline at the base that looks like a mask. These birds build their nests directly ...

Under these drastically changing conditions, the struggle to survive favored the larger birds with deep, strong beaks for opening the hard seeds. Smaller finches with less-powerful beaks perished.

Birds have feathers and a beak and lay hard-shelled eggs. Many birds are able to fly using their wings, but others such as ostriches are flightless and unable to fly. Some birds like penguins ...