Mule deer live in herds and eat leaves and bark of shrubs, as well as grass in meadows. They prefer edge habitats where forest meets grass. They are most often seen in early morning and early evening. They sleep or ruminate (re-chew their stomach contents) much of the day. The most noticeable differences between whitetails and mule deer are the size of their ears, the color of their tails, and the configuration of their antlers. In many cases, body size is also a key difference. The mule deer's tail is black-tipped, whereas the whitetail's is not. Mule deer antlers "fork" as they grow, rather than branching from a single main beam, as is the case with whitetails.