The Patagonian mara resembles a jackrabbit. It has distinctive long ears and long limbs, with the hind limbs being longer and more muscular than its fore limbs and having a longer radius than humerus. The feet are compressed, making them hoof-like in appearance. The fore feet have four digits while the hind feet have three digits, possibly to reduce weight, while its tail is short, depressed, and hairless. It has a gray dorsal pelage with a white patch on the rump separated from the dorsal fur by a black area. In addition, the mara has a white underside with a somewhat orange flank and chin. It has a head and body length of 69–75 cm (27–30 in) with a tail of 4–5 cm (1. 6–2. 0 in). It weighs 8–16 kg (18–35 lb). Unlike most other cavids, the anal glands of the mara are between the anus and the base of the tail rather than being anterior to the anus.