Males weigh 50 to 100 pounds, females 40 to 50 to pounds. They have shaggy dark gray fur, almost black in the adult males. Wallaroos are distinguished from other kangaroos by their bare, black snout. Prefer to live in areas of rocky outcrops or stony ground. A mother with subadult and mature offspring may comprise a small group.
Adults also come together at preferred spots for feeding, water, or shade.
Live in high rock outcrops during the day and descend to feed in the grasses of the flat meadows at night. Sexually mature at 18-24 months. May breed throughout year. After a 32-day pregnancy, a blind, hairless baby less than an inch in size is born. After climbing to the pouch, the joey attaches to one of the nipples and remains attached for the next seventy days.