There was a now-extinct family of giant kangaroos, the Sthenurinae. They were adapted for browsing in woodland areas, rather than open grassland. The largest ("Procoptodon goliah") had an estimated body mass of 240 kg., which is almost three times the weight of the largest living kangaroos. Probably they moved at slower speeds, since hopping was not possible. They would have moved by striding (walking). The family went extinct about 30,000 years ago.