Flying lemurs are unusual animals. They have a lemur-like face, but are not related to the primates. Indeed, they are unique to the mammalian class, having no living relatives. They are most noted for a membrane of skin that stretches from the neck to the forepaws to the hind feet to the tip of the tail. This skin allows them to glide distances of 330 ft (100 m), giving them the appearance that they are flying.