Deer or true deer are hoofed ruminant mammals forming the family Cervidae. The two main groups of deer are the Cervinae, including the muntjac, the elk, the red deer, the fallow deer, and the chital; and the Capreolinae, including the reindeer, the roe deer, the mule deer, and the moose. The moose or elk, is a member of the New World deer subfamily and is the largest and heaviest extant species in the deer family. Most adult male moose have distinctive broad, palmate antlers; most other members of the deer family have antlers with a dendritic configuration. Odocoileus virginianuswhite-tailed deer · Geographic Range. Whitetail deer inhabit most of southern Canada and all of the mainland United States except two or three states in the west. · Habitat · Physical Description. The average wild white-tail deer lives about 4.5 years. The oldest wild deer are reported to live into the late teens, with the oldest wild white-tail deer on record being 19. The oldest wild mule deer on record was 20, and the oldest wild black-tailed deer on record is 22. You can read more on this here.