Antler

Antlers are extensions of an animal's skull found in members of the deer family. They are true bone and are a single structure. They are generally found only on males, with the exception of the caribou. Antlers are shed and regrown each year and function primarily as objects of sexual attraction and as weapons in fights between males for control of harems.

Antlers differ from horns in that they are made of bone, while horns are a core of live bone surrounded by keratin.