在许多拥有较长幼年期的物种中，雌性选择让雄性孵化后代来增加雄性对子代的感情投入。
In many species with long childhoods, female choice bred males to evolve increasing emotional investment in their offspring.
在雌性统治的鬣狗世界，雌性选择配偶，守卫领地，抚育幼兽，根据自己的意愿允许雄性停留，或者踢出去。
In the hyena world it is the female that rules, choosing her mate, guarding territory, rearing cubs and allowing the male to stay or kicking him out as she sees fit.
证据表明，莺主要用它们极其精致的歌声吸引雌性，这清楚地证实了雌雄间选择对鸟类鸣叫进化的影响。
The evidence suggests that warblers use their extremely elaborate songs primarily to attract females, clearly confirming the effect of intersexual selection on the evolution of birdsong.
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