雌性哺乳动物通常负责照顾幼崽。

___Females of mammalian species usually take care of their young.

这只动物园里有五只雌性动物和三只雄性动物。

There are five ___females and three males in this zoo.

雌性鸟类通常会筑巢并照顾幼崽。

___Female birds usually build nests and care for their young.