When a new male lion takes over a pride what he does is kill all the remaining cubs and any lionesses undergo spontaneous abortions.

当一个新雄狮接管领地,它将杀死留下的幼仔,和任何经历过自然流产的雌狮。

耶鲁公开课 - 心理学导论课程节选

The females do their spontaneous abortions because that's a reliable adaptive trick.

自然流产时雌狮用的适应技巧。

耶鲁公开课 - 心理学导论课程节选