Zhao Nanyuan will tell you what "free will" is.
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送交者: Amsel 于 2009-10-26, 16:33:35:
回答: 这个需斑竹科普动物如何自我识别：鸭从没把自己认成鸡，即使鸭同鸡一起被鸡妈妈孵出 由 heartwaver 于 2009-10-26, 16:03:37:
As a child I have seen a rooster mating a female duck at one of my neighbors', who fed the poor duck together with chicken. Obviously the rooster and the duck did not regard each other as different species.
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