Australian megafauna
Procoptodon goliah (the Giant Short-faced Kangaroo) is the largest kangaroo to have ever lived. It grew 2–3 metres (7–10 feet) tall, and weighed up to 230 kilograms. It had a flat, shortened face with jaw and teeth able to chew tough, desert plants. It had forward-looking eyes providing three dimensional vision. Procoptodon was one of seventeen species, in three genera in the Sthenurine subfamily, which are all extinct. Sthenurines lived in open woodlands in central northern Australia. All sthenurines had a hoof-like, fourth toe on the back legs. Their other toes were not fully formed. They also had elastic ligaments between the toe bones; this gave them more spring and speed compared to modern kangaroos. Sthenurine front legs were long, with two long fingers and claws, compared with the small, stiff arms of modern kangaroos. These may have been used for pulling branches nearer for eating and for walking on all four legs for short distances.