The pampas fox (Lycalopex gymnocercus) resembles the culpeo or Andean fox/ in appearance and size, but has a proportionately wider snout, reddish fur on the head and neck, and a black mark on the muzzle. It has short, dense fur that is grey over most of the body, with a black line running down the back and onto the tail, and pale, almost white, underparts. The ears are triangular, broad and relatively large, and are reddish on the outer surface and white on the inner surface. The inner surfaces of the legs are similar in color to the underparts, while the outer surface is reddish on the forelimbs, and grey on the hindlimbs; the lower hindlimb also bears a distinctive black spot. Adults range from 51 to 80 centimetres (20 to 31 in) in body length, and weigh 2.4 to 8 kilograms (5.3 to 17.6 lb); males are approximately 10% heavier than females.