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.

• 雄鼠有时候会吃掉他的幼崽而不是养育它们，因此对于研究那些不存在杀婴行为的物种来说是，老鼠不是一个好的模型。