The order Lagomorpha consists of rabbits, hares, and pikas. Once included in the order Rodentia, the differences found in lagomorphs earned them an order of their own.
Rabbits differ from rodents in that rabbits have two sets of upper incisors, rather then one.
Rabbits also have spongy intertwined bone lining their upper jaws that is believed to aid in heat dispersal when the animals are running. Rabbits and hares are fast and evasive and have large hind limbs suited for leaping great distances. Many have large ears that alert them to predator threats. The incisors and molars grow throughout these animals' lives, and are completely covered by enamel. Natural Bone Catalog No.