Hares and jackrabbits are leporids belonging to the genus Lepus. Hares are classified in the same family as rabbits. They are similar in size and form to rabbits and have similar herbivorous diets, but generally have longer ears and live solitarily or in pairs. Also unlike rabbits, their young are able to fend for themselves shortly after birth rather than emerging blind and helpless. Most are fast runners. Hare species are native to Africa, Eurasia, North America, and the Japanese archipelago. Five leporid species with "hare" in their common names are not considered true hares: the hispid hare (Caprolagus hispidus), and four species known as red rock hares (comprising Pronolagus). Conversely, jackrabbits are hares, rather than rabbits. A hare less than one year old is called a leveret. A group of hares is called a "drove".