The beak, bill, or rostrum is an external anatomical structure of birds which is used for eating and for preening, manipulating objects, killing prey, fighting, probing for food, courtship and feeding young.
In birds, the beak, bill, or rostrum is a crucial external feature used for consuming food, grooming, manipulating items, capturing prey, engaging in combat, sensing surroundings, attracting mates, and nourishing young.