Australian brushtail possum moms, for example, invest more resources in their daughters, so when these resources are scarce, they have more male offspring.

例如澳大利亚毛尾负鼠妈妈们在她们女儿身上付出了更多的资源，因此当她们资源有限的时候，她们就会有更多的雄性后代。