Deer antlers

Antlers are extensions of the skull grown by members of the deer family. They are not true bone structures but they usually grow in symmetrical pairs. With the exception of caribou,[1] antlers only grow on males. Antlers function primarily as objects of sexual attraction and as weapons in fights for control of harems. In many temperate zone species, antlers are shed and regrow each year; horns, in contrast, are permanent..