Deer are native to all continents except australia and antarctica, and many species have been widely introduced beyond their original habitats as game animals.. Deer are primarily herbivorous mammals that constitute cervidae, the second most diverse family of artiodactyls after bovids (family bovidae).
Deer, any of 43 species of hoofed ruminants in the order artiodactyla, notable for having two large and two small hooves on each foot and also for having antlers in the males of most species.. Deer live in a variety of biomes, ranging from tundra to the tropical rainforest.