Females are also able to reabsorb embryos under adverse conditions. Because of the high reproductive ability and high predation, some hare and rabbit species show cycles of population fluctuations. The Snowshoe hare is a good example of this cyclic phenomenon. All rabbits and hare are adapted for quick movement and fast exit from danger. Hind legs are strong.
Ears are large and mobile to detect predators movements.
Eyes are adapted to twilight and night-time activities. Forefeet have five toes, hindfeet have four, all having claws. Hares usually use surface depressions, called forms, as resting sites. Some hare species may burrow during adverse conditions. Rabbits burrow underground networks of tunnels and chambers and show considerable variety in form depending on species and habitat.