The beak, bill, or rostrum is an external anatomical structure of birds that is used for eating and for grooming, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young.
The terms beak and rostrum are also used to refer to a similar mouth part in some Ornithischian dinosaurs, monotremes, cephalopods (see Cephalopod beak), cetaceans, billfishes, pufferfishes, turtles, Anuran tadpoles and sirens.
Although beaks vary significantly in size, shape, color and texture, they share a similar underlying structure.
In most species, two holes known as nares lead to the respiratory system.
Although beaks vary significantly in size and shape from species to species, their underlying structures have a similar pattern.
All beaks are composed of two jaws, generally known as the upper mandible (or maxilla) and lower mandible (or mandible).
The upper, and in some cases the lower, mandibles are strengthened internally by a complex three-dimensional network of bony spicules (or trabeculae) seated in soft connective tissue and surrounded by the hard outer layers of the beak.
The upper mandible is supported by a three-pronged bone called the intermaxillary.
The upper prong of this bone is embedded into the forehead, while the two lower prongs attach to the sides of the skull.At the base of the upper mandible a thin sheet of nasal bones is attached to the skull at the nasofrontal hinge, which gives mobility to the upper mandible, allowing it to move upwards and downwards.The base of the upper mandible, or the roof when seen from the mouth, is the palate, the structure of which differs greatly in the ratites.Here, the vomer is large and connects with premaxillae and maxillopalatine bones in a condition termed as a "paleognathous palate".All other extant birds have a narrow forked vomer that does not connect with other bones and is then termed as neognathous.The shape of these bones varies across the bird families.