Motherhood and the Relationships of the Sexes
Some explanation must be sought for the almost bewildering diversity which we find in this relationship; for while the young of some animals (and often among low types where least we should expect it) are jealously guarded and cared for by at least one of the parents, in others there is no trace of such sacrifice and solicitude, and the young are thrown on to the world, orphaned before they are born, and left to live or die as chance decrees.