Mammal 哺乳動物

AP
Two different studies reach opposing conclusions about why monogamy evolved in mammals.
Monogamous Animals: Studies Differ On How Monogamy Evolved In Mammals http://www.huffingtonpost.com/2013/07/30/monogamous-mammals-studies-disagree-why-monogamy-evolved_n_3675733.html

Mammal - Wikipedia, the free encyclopedia http://en.wikipedia.org/wiki/Mammal
哺乳動物 - 維基百科，自由的百科全書  http://zh.wikipedia.org/wiki/%E5%93%BA%E4%B9%B3%E5%8A%A8%E7%89%A9

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