A new study suggests that having too many males of one species could lead to more sexual aggression toward females and ultimately the extinction of the species.

• 挪威生物学家的一份最新研究结果显示,如果一个物种中,雄性个体的数量过多,将会导致雌性个体受到更多的性侵犯,最终这一物种还可能因此而走向灭绝。