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 ...

Seed-eating birds require these strong beaks to exert the force needed to ... each adapted to their specific foraging techniques and the types of insects they consume. Warblers, vireos, and ...

“normal” beaks (examples shown of a petrel and a gull) and a bird with a tactile bill-tip organ (a tinamou, close relative of ostriches and emus and which has an ancestral bill-tip organ ...

The struggle is mainly about food -- different types of seeds -- and the availability ... the struggle to survive favored the larger birds with deep, strong beaks for opening the hard seeds.