Females are slightly smaller than males (10 to 20%).

Adults are 120 to 190 cm (47 to 75 in) long, of which about 10 to 15% is the tail. The weight of an adult male is about 160 kg (350 lbs) and of a female about 125 kg (275 lb), although there are females weighing only 70 kg (154 lbs).