White-tailed deer spend their mornings and evenings grazing for food. They're herbivores, so they eat green plants and nuts. Deer live in small groups -- usually just a mother and her fawns. Males, called bucks, have magnificent antlers and live in small groups of three or four. Deer are ruminants, like cattle. This means they have four stomachs and chew on semi-digested food, called cud. This complicated process allows deer to eat things like twigs that most animals can't digest.