Human beings are an exception to many general rules in biology. In many species, female mate choice alone is important; in our species, male mate cho… - Steve Stewart-Williams

People kill nonhuman animals for food, for their skins, and sometimes just for fun. We enslave animals and force them to work for us. We experiment on them and justify their suffering in terms of our advantage. Because most of us want to be able to view ourselves as good people (and, perhaps more importantly, because we want others to view us as good people), we may be motivated to view nonhumans in such a way that these activities are rendered morally unproblematic. One way to do this is to view other animals as utterly different from us.

As a result of high levels of male parental investment, humans evolved into a somewhat “androgynous” species - a species in which human females exhibit traits generally found only in males (e.g., competition for mates) and human males exhibit traits generally found only in females (e.g., the provision of parental care; choosiness about mates).

Language, intelligence, and humor, along with art, generosity, and musical ability, are often described as human equivalents of the peacock’s tail. However, peacocks afford a poor analogy for the role of courtship displays in humans. Other animal models offer a better fit. In a number of nonhuman species — species as diverse as sea dragons and grebes — males and females engage in a mutual courtship “dance,” in which the two partners mirror one another’s movements. In Clark’s grebes and Western grebes, for instance, the pair bond ritual culminates in the famous courtship rush: The male and female swim side by side along the top of the water, with their wings back and their heads and necks in a stereotyped posture. If we want a nonhuman analogue for the role of creative intelligence or humor in human courtship, we should think not of ornamented peacocks displaying while drab females evaluate them. We should think instead of grebes engaged in their mating rush or sea dragons engaged in their synchronized mirror dance. Once we have one of these alternative images fixed in our minds, we can then add the proviso that there is a slight skew such that, in the early stages of courtship, men tend to display more vigorously and women tend to be choosier. However, this should be seen as a qualification to the primary message that intelligence, humor, and other forms of sexual display are part of the mutual courtship process in our species.