Rabbits vary in size and weight. As lagomorphs, they have four incisors on their top jaw and two on the bottom jaw, that grow continuously throughout their life. This is distinct from rodents, which have two each on the top and bottom. Rabbits have long ears, large hind legs, and short fluffy tails. Rabbits move by hopping, using their long and powerful hind legs. To facilitate quick movement, rabbit hind feet have a thick padding of fur to dampen the shock of rapid hopping. Their 4 toes are long, and are webbed to keep them from spreading apart as they jump. They have 5 digits on their front paws. Depending on the species of the rabbit, one can reach a speed of 15-20 m/s (35-45 mph). Young rabbits appear to 'walk', instead of hopping.
Some species are well-known for digging networks of burrows, called warrens, where they spend most of their time when not feeding.
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Article By : http://www.mypets.net.au/pl/rabbits/53/1