Not surprisingly , maternal infanticide is mainly a crime of poor , single women .
一点也不奇怪,杀婴母亲主要是贫穷、单身者。
In some species , such as lions and langurs , this results in deliberate infanticide .
在诸如狮子及叶猴等物种中,这导致了故意杀婴。
The result has long been a surplus of men , because of female infanticide or excess female deaths through neglect .
结果就是男性过剩,因为女性杀婴以及因为疏忽而过量的女性死亡。
Male rats sometimes eat their young rather than nurture them , which makes them a poor model for studying how fatherhood affects the brains of species that frown on infanticide .