Antlers are bony structures that grow on the heads of members of the Cervidae family, which includes animals like deer, moose, and elk. Unlike horns, which are permanent and made of keratin, antlers are shed and regrown each year. They are typically found only on males, although some female reindeer also have them. Antlers serve various purposes, including attracting mates and establishing dominance during mating season. They can vary greatly in size and shape, depending on the species and the individual animal's age and health. The growth of antlers is influenced by factors such as nutrition and genetics.