盘点八种能识数的动物 食蚊鱼计算依靠比率(4)
2009-06-25 09:31:38
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4 美国黑鸭
美国黑鸭能被哄骗去孵化其他黑鸭的蛋。为了不上当受骗,它们只把自己下的蛋的总合算出来,对其他突然出现的蛋置之不理。
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