One theory is that bipedality evolved in conjunction with the nuclear family: monogamous parents cooperating to care for their offspring.
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。
Prairie voles live in family groups consisting of a monogamous mated pair and their offspring.
一对单配偶的橙腹田鼠及其子女组成家庭，一起生活。
Prairie voles live in family groups consisting of a monogamous mated pair and their offspring.
一对单配偶的橙腹田鼠及其子女组成家庭，一起生活。
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