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Homo erectus was probably the first hominid to live in a hunter-gatherer society, and anthropologists such as Richard Leakey believe that erectus was socially more like modern humans than the more Australopithecus-like species before it. Erectus is also thought to be the first hominid species to hunt in coordinated groups, to use complex tools, and to care for infirm or weak companions. All these traits we inherited from Erectus.