Horns are hard structures growing from the animals’ heads. Most horned animals, for example, sheep, cattle, goats, and antelope, also have hooves. Horns vary greatly in size and shape. They are attached to the bone of an animal’s head. Horns are made of keratin, the same material that makes up hooves, hair, fingernails, and feathers. Horns grow in pairs as the animals get older.
Animals use horns as weapons to protect themselves from enemies and in battles with other animals of their kind.
Hornlike antlers, which are not true horns, grow from the heads of deer, elk, and moose. Antlers are bone with a velvety covering and they fall off every year.