Why do some animals have horns?

Animals develop horns primarily for defense, territorial fights, and attracting mates. Horns are made of keratin, the same material as human hair and nails, and they grow throughout an animal’s life. Male animals, such as bighorn sheep and antelopes, often use their horns in battles with rivals for dominance or access to mates. In other species, horns are used for protection against predators. Some animals, like certain species of goats and antelopes, use their horns to defend themselves against threats or intruders in their territory.