Water deer small deer farms in the southeastern United States have successfully bred water deer. The water deer has narrow pectoral and pelvic girdles, long legs, and a long neck. The powerful hind legs are longer than the front legs, so that the haunches are carried higher than the shoulders. They run with rabbit-like jumps. In the groin of each leg is an inguinal gland used for scent marking; this deer is the only member of the Cervidae to possess such glands. The short tail is no more than 5–10 cm / 1.9–3.8 in. in length and is almost invisible, except when
European rabbit naked, have white flesh, and little sexual dimorphism. However, the two differ in skull characteristics, and cottontails do not habitually construct their own burrows as the European rabbit does. Molecular studies confirm that the resemblance between the two is due to convergent evolution, and that the European rabbit's closest relatives are the hispid hare, the riverine rabbit and the Amami rabbit. The oldest known fossils attributed to the modern European rabbit species are around 0.5 Ma old (Middle Pleistocene). , six subspecies are recognised. The European rabbit is smaller than the brown and mountain hare, and lacks black ear-tips, as