水豚，世界上最大的啮齿类动物，生活在阿根廷东北的伊维拉湿地。一个水豚家族中有多达20个成员。雌性水豚一起抚养幼崽，平等地哺乳整个族群的后代，这种做法在动物界中十分罕见。
遇播放卡顿或无法播放时，可切换线路播放
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