Tammar wallabies are the smallest species of wallaby, reaching only 20-27 inches in length. They are sexually dimorphic, with males growing to be larger than females. Males weigh an average of 20 pounds, while females weigh an average of only 15 pounds. The coat is short and dark grey in color on top with tan below and red on the sides. Like other macropodids, the hind limbs are longer than the forelimbs. The head is small with large ears. Females have a pouch of skin on the abdomen for nursing offspring.