Hares and jackrabbits are leporids belonging to the genus Lepus. Hares less than one year old are called leverets. Four species commonly known as types of hare are classified outside of Lepus: the hispid hare (Caprolagus hispidus), and three species known as red rock hares (Pronolagus spp.).
Hares are very fast-moving. The European brown hare (Lepus europaeus) can run at speeds of up to 72 km/h (45 mph). They live solitarily or in pairs, while a "drove" is the collective noun for a group of hares. Their bodies are capable of absorbing the g-force produced while running at extreme speeds or while escaping predators.