Motherhood and the Relationships of the Sexes
Mr. Pycraft continues—      “Neither polygamy nor polyandry among the lower animals, at any     rate, has been brought about or is maintained by the excessive     death rate due to combats for the possession of mates, but     must be explained as demonstrating inherent changes in the     germ-plasm, disturbing the relative proportions of the sexes     and correlated with a profound transformation, not only in     the behaviour of the sexes during the period of reproductive     activity, but also in their physical characteristics.”