鼠标是一个很小的动物，从啮齿动物的家庭。
事实上，畜产品的生产并不是靠养一小群动物的家庭农场，而是类似于大型有组装线的工厂。
The truth is that farm production does not depend on the family farmer witha small herd of animals but instead resembles a large, assembly-line factory.
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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