Hares and jackrabbits are mammals belonging to the genus Lepus. They are herbivores, and live solitarily or in pairs. They nest in slight depressions called forms, and their young are able to fend for themselves shortly after birth. The genus includes the largest lagomorphs. Most are fast runners with long, powerful hind legs, and large ears to dissipate body heat. Hare species are native to Africa, Eurasia and North America. A hare less than one year old is called a 'leveret'. A group of hares is called a 'husk', a 'down' or a 'drove'. Hares are swift animals and can run up to 80 km/h (50 mph) over short distances. Over longer distances, the European hare (Lepus europaeus) can run up to 55 km/h (35 mph). The five species of jackrabbits found in central and western North America are able to run at 65 km/h (40 mph) over longer distances, and can leap up to 3 m (10 ft) at a time. Normally a shy animal, the European brown hare changes its behavior in spring, when it can be seen in daytime chasing other hares. This appears to be competition between males to attain dominance for breeding. During this spring frenzy, animals of both sexes can be seen 'boxing', one hare striking another with its paws. This behavior gives rise to the idiom 'mad as a March hare'. This is present not only in intermale competition, but also among females toward males to prevent copulation. (Source: Wikipedia.org, CC BY-SA)