Deer are the ruminant mammals forming the family Cervidae. Species in the family include white-tailed deer, mule deer such as black-tailed deer, elk, moose, red deer, reindeer , fallow deer, roe deer, pudú and chital. Male deer of all species and female reindeer grow and shed new antlers each year. In this they differ from permanently horned animals such as antelope, which are in the same order as deer and may bear a superficial resemblance.