与大多数哺乳动物相比，人类女性生育和保持胎儿处于无助的幼年期的时间更长。
Compared to most mammals, human females give birth to a fetus, and it stays helpless a very long time.
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.
尤其影响幼年期的鱼类，韦斯特曼说道，“过去几年里，在这片群岛内部的区域，像梭子鱼和鲈鱼这样的常见鱼类都几乎不再来繁殖了。”
In the past couple of years common fishes like pike and perch have had virtually no reproduction in the inner part of the archipelago.
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