One of the interesting facts about wallaroos is that these animals use their tail as a third leg, for support while sitting. They have coarse shaggy fur, that can be dark gray, reddish, or black in color. These animals have bare muzzles, large ears, and black snouts. In general, wallaroos have a particular posture with their wrists raised, shoulders thrown back, and the elbows drawn close to the body. Wallaroos thump their feet to warn others of impending danger, and when threatened, they emit hissing sounds.