Structure and Function
A beak is the hard, pointed projection that forms a bird's mouth. Made of keratin—the same protein in human hair and nails—beaks are used for eating, drinking, preening, climbing, communication, courtship, and defense.
Variety of Shapes
Beaks vary widely by species. Hummingbirds have long, thin beaks for sipping nectar, while eagles have powerful, hooked beaks for tearing flesh.