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Studies show chimps being spontaneously helpful to other chimps and humans in complex ways, without benefit of any rewards. Increasingly humans want to get "payed" for such helpfulness to other humans. And as for humans helping animals, well..............

Studies show that chimps demonstrate helpiing other chimps and humans previously unknown to them, without any incentive for reward. Increasingly humans want to get "payed" for helping other humans, and animals are just for food or emotional gratification.