 This is present not only in intermale competition, but also among females toward males to prevent copulation.All rabbits (except the cottontail rabbits) live underground in burrows or warrens, while hares (and cottontail rabbits) live in simple nests above the ground, and usually do not live in groups.Hares do not bear their young below ground in a burrow as do other leporids, but rather in a shallow depression or flattened nest of grass called a form.