New research suggests human hunting played a major role in the extinction of kangaroos, challenging the climate change theory

In a mass extinction event some 40,000 years ago, Australia lost 90% of its large species. New research suggests climate change played a much smaller role than once thought, though not all agree.

In a mass extinction event some 40,000 years ago, Australia lost 90% of its large species, including nearly two dozen kinds of kangaroos.