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.
Samuel Arman and colleagues' close examination of tooth microwear among living and extinct kangaroo species suggests that most of the species living ...
Their fossils have been found in North America ... The fact that different sabre-toothed species evolved varying balances between puncture efficiency and strength suggests a broader range of hunting ...