Many animals have hard structures, called horns, growing from their heads. Most horned animals also have hooves. Sheep, cattle, goats, and antelope are some of the most common horned animals.

Horns are hollow and pointed. They are attached to the bone of an animal’s head. Horns are made of keratin, a type of protein. Keratin is the same material that makes up hooves, hair, fingernails, and feathers. Animals may be born with those things, but animals are not born with horns. The horns grow as the animals get older.

Horns grow in pairs, one on each side of the head. Horns vary greatly in size and shape. Bighorn sheep have large, curled horns. Antelope have long, thin horns that point upward. Oxen have long, heavy horns that stick out from the sides of their heads.

Animals use horns as weapons to protect themselves from enemies. They also use their horns in battles with other animals of their kind. In some types of animals, only the male has horns. In others, both males and females have horns. A large set of horns may impress mates. They show that the animal has lived a long time and can defend itself.

Hornlike antlers grow from the heads of deer, elk, and moose. Antlers are not true horns, however. They are bone with a velvety covering. Antlers fall off every year. Horns never fall off.

Many lizards have bony stalks that look like horns. Giraffes have knobby growths made of bone covered with skin and hair. The single horn of a rhinoceros is actually made of hardened hairs that are tightly bunched together.

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