Where’s the Beef? Early Humans Took It
When human ancestors began scavenging for meat regularly on the open plains of Africa about 2.5 million years ago, they apparently took more than their fair share of flesh. Within a million years, most of the large carnivores in the regionâ€”from saber-toothed cats to bear-size ottersâ€”had gone extinct, leaving just a few “hypercarnivores” alive, according to a recent study.
Humans have driven thousands of species extinct over the millennia, ranging from moasâ€”giant, flightless birds that lived in New Zealandâ€”to most lemurs in Madagascar. But just when we began to have such a major impact is less clear. Researchers have long known that many African carnivores died out by 1.5 million years ago, and they blamed our ancestor, Homo erectus, for overhunting with its new stone tools. But few scientists thought there were enough homininsâ€”ancestors of humans but not other apesâ€”before that to threaten the fierce assortment of carnivores that roamed Africa, or that the crude stone tools that our ancestors began to wield 2.6 million years ago could be used for hunting.