有一种理论认为，两足动物的进化与核心家庭有关：一夫一妻制的父母合作照顾他们的后代。

One theory is that bipedality evolved in conjunction with the nuclear family: monogamous parents cooperating to care for their offspring.

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这些类似老鼠的生物是哺乳动物中少数（不到5%）有人类一般的一夫一妻制倾向的动物之一。

These mouselike creatures are among the small minority of mammals — less than 5 percent — who share humans’ propensity for monogamy.

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这些类似老鼠的生物是哺乳动物中少数(不到5%)有人类一般的一夫一妻制倾向的动物之一。

These mouselike creatures are among the small minority of mammals - less than 5 percent - who share humans' propensity for monogamy.

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