ABSTRACT
Sexual dimorphism is the question of the differences between the males and females of the same species, and the most conspicuous difference is usually in size. On learning that in certain species of fish the females are enormously larger than the males, and slightly so even among such mammals as the hyena, we humans may even, perhaps, feel slightly ill at ease. The rule that holds for the great apes, where males are considerably larger, is in any case more reassuring.
