Red ruffed lemurs have a head and body length of about 20 inches. Their tail length is about 24 inches and their weight is just under 8 pounds. Most of the dorsal body coat is a deep, rusty red. There is a white patch on the neck, and small patches of white may appear on the heels, digits and muzzle. The extremities, tail, insides of the limbs, forehead, and crown (excluding the ears) are black. Some variations to this coloration may exist. Females have 3 pairs of mammae.