之所以说这个现象有趣，是因为母羚羊因产雄性子羚羊而在分娩时（或随后一周内）引起的死亡率是生产雌性子羚羊的3倍。
The reason this is interesting is that a lechwe mother is three times as likely to die while giving birth to a son (or during the subsequent week) as when she bears a dauhter.
每只雌性在4月或5月份将只产一颗卵。
但是黑猩猩经常会为领土而战，雌性黑猩猩经常在她们产第一个孩子的时候就离开了原来的群体。
But the chimpanzees have territorial fights, and females typically leave their native group before having their first babies.
在雌性瓢虫的一生中将产下多达2000枚的卵。
In its lifetime, a female ladybug will lay as many as 2, 000 eggs.
下一阶段也是进行同样的实验，但比对的雌性蜣螂变成体型相等，角的大小却有所不同，藉此观察角较大的雌性蜣螂是否会产下更多后代。
The next stage, though, was to do the same experiment, but match females who were the same size except for their horns, in order to see if a bigger horn results in more offspring.
一些雌性会无视巢，或者只在里面挖，却把卵产在其他地方，让她们的饲主失望。
Some females will ignore nesting boxes, or dig in them only to lay their eggs elsewhere, much to their owners' frustration.
冬天，雌性北极熊会在洞穴里生育，通常都会产下双胞胎。
A female polar bear gives birth, usually to twins, in a snow den in winter.
此外，雌性黑猩猩一旦携带病毒后生育能力急剧下降，它们产下的幼仔存活率也相对较低。
In addition, the female chimpanzee virus, once after a sharp decline in fertility, birth of the baby they have relatively low survival rate.
此外，雌性黑猩猩一旦携带病毒后生育能力急剧下降，它们产下的幼仔存活率也相对较低。
In addition, the female chimpanzee virus, once after a sharp decline in fertility, birth of the baby they have relatively low survival rate.
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