One common explanation of social monogamy is that it's a result of females choosing mates based on the male's ability to provide for his off spring and protect them from being killed by hostile males or by predators.
关于社会一夫一妻制的常见解释是，这是雌性需要雄性养育后代的能力，并保护幼崽不被其他有敌意的雄性或食肉动物杀害^gX.RO3sL,kPoaI+)1。

As you can imagine, females who have help from males produce more litters, and have more offspring that survive to pass on that paternal behavior.
正如你所想象，在雄性动物的帮助下，雌性可以繁衍出更多的幼崽，并且会有更多的后代存活下来，这种父系行为模式就可以世代流传下去H0t1J~!tT_fz。
Actually, a study suggests that maybe things happened the other way around, that monogamy evolved first and that paternal instincts evolved later and helped stabilize monogamy.
事实上，一项研究表明，事实可能恰好相反，首先是一夫一妻制不断进化，之后父性本能才开始进化，并最终巩固了一夫一妻制wcX4~~vrYQ;4~F;QGh。

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