The more humans spread, the smaller other mammals get. Elephants, rhinos and hippos had better watch out

In addition, she found that the extinction events were swifter and more dramatic as time went on. The extinction event was slow and long in Eurasia, and much speedier and deadlier in the Americas. This suggests that as humans developed more advanced weaponry, they were more effective at eradicating large animals quickly, she said.

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