In most cases these actions are only symbolic. There is no intromission and no orgasm. They fake it. You wish to pay respect to a high-ranking male, but Nature has not equipped you with appropriate spoken language. Still, there are many postures and gestures in your everyday life that have a meaning readily apprehended by everyone. If females must comply with nearly every proferred sexual invitation, the sex act itself is a vivid, powerful, and unambiguous symbol of submission. Indeed, presenting is a mark of deference and respect among all the apes and monkeys, and among many other mammals as well.
The anger of a high-ranking male is fearsome. His arousal is obvious to any bystander, because all the hair on his body is standing on end. He may charge, intimidate, and tear branches from trees. If you’re not prepared to meet him in single combat, you might want to appease him, to keep him happy. You closely monitor the slightest raising of a single one of his hairs. Not only are you perpetually compliant (“I’m yours whenever you want me”), but just for your own comfort you need frequent reassurance that he’s not angry with you. When he is angry, he exaggerates his size and ferocity and displays the weapons that he will bring to bear if the adversary does not submit. He uses his displays to keep more junior males in line, and they use theirs to advance within the hierarchy. Displays may serve as a response to a challenge, or just as a general reminder to the community at large that here’s someone not to be trifled with. Of course, it’s not all bluff; if it were, it wouldn’t work. There must be a credible threat of violence. A kind of menace maintenance is required. If push comes to shove there may be serious fighting. But much more often the display has a ritual and ceremonial character. (Almost always the alpha wins, and if, on occasion, he loses, that doesn’t usually mean that the hierarchy has been inverted; for that to happen, a consistent pattern of defeat is needed.)
The lesson being communicated is deterrence, pure and simple: “Cross me and you’ll have to deal with this stature, these muscles, these teeth (note my canines), this rage.” Chimpanzee strategy is encapsulated in the earliest comprehensive account we have of human military affairs, the sixth-century B.C. work The Art of War, by Sun Tzu: “The supreme act of war is to subdue the enemy without fighting.”3 Deterrence is old. And so is its prerequisite, imagination.
So law and order are maintained, and the status of the leadership preserved through the threat (and, if necessary, the reality) of violence; but also through patronage delivered to constituents, and through the widespread craving to have a hero to admire, who can tell you what to do—especially when there’s a threat from outside the group. Violence and intimidation alone would not suffice—although there may be those who enjoy being chastised and bullied, who perhaps look on it as a form of affection.
Male chimps are obsessively motivated to work their way up the dominance ladder. This involves courage, fighting ability, often size, and always real skill in ward-heeler politics. The higher his rank, the fewer the attacks on him by other males and the more gratifying instances of deference and submission. But the higher his rank the more he will be obliged to take pains to reassure subordinates. The dominance hierarchy makes for a stable community not only because the high-ranking males break up fights among their subordinates, but also because the very existence of hierarchy, along with the genetic tradition of compliance, inhibits conflict. One powerful motivation to be high-ranking is that the top echelons often have preferential sexual access to ovulating females. As in all mammals, this behavior is mediated by testosterone and related steroid hormones. Leaving more offspring is what natural selection is about. For this reason alone, hierarchy makes evolutionary sense.
The alpha male, merely by virtue of his exalted status, stimulates the formation of cabals to depose him. A lower-ranking male may challenge the alpha by bluff, intimidation, or real combat, as a step towards reversing their relative status. Especially under crowded conditions, females can play a central role in encouraging and helping to implement coups d’état. But the alpha male is often prepared single-handedly to take on coalitions of two, three, or four opponents.
Alphas enforce authority; betas and others sometimes challenge it—not on abstract philosophical grounds, but as a means to selfish ends. We might guess that both warring inclinations are built into us too, a different balance in different people, with much depending on the social environment. The roots of tyranny and freedom trace back to long before recorded history, and are etched in our genes.
Over a period of years in a typical small chimpanzee group, half a dozen different males may become alpha in succession—because of death or illness of the dominant male, or because of challenges from below. On the other hand, an alpha male maintaining his status for a decade is not unknown either. Perhaps coincidentally, these terms of office are roughly those typical of human governments—ranging, respectively, from Italy, say, to France. Political assassination—that is, dominance combat in which the loser dies—is rare.
In combat, males are more likely to hit, kick, stomp, drag, and wrestle. Or throw stones and beat with clubs, if any are handy. Females are more likely to pull hair and scratch, and to grapple and roll. For all their baring of teeth, males rarely bite anyone in the group, because their canines can do terrible damage. They may flash the razors and switch-blade knives, but they hardly ever draw blood. Females with much less prominent canines have fewer inhibitions. Any given fight is likely to stimulate other fights among unrelated or even nonaligned parties. One combatant may poignantly appeal for aid from passersby, who may, in any case, be attacked for no apparent reason. Any conflict seems to raise the testosterone level in all the male bystanders. Everyone’s hair stands on end. Perhaps long-standing resentments flare. General mayhem often results.
Chimps will place their fingers between the teeth of a high-ranking male and derive reassurance when the fingers are returned intact. At times of rising group tension, male chimps may touch or heft each other’s testicles, as the ancient Hebrews and Romans are said to have done upon concluding a treaty, or testifying before a tribunal. Indeed the root of “testify” and “testimony” is the Latin word, testis. The significance of the gesture, less common now that men wear pants, is not only transcultural, but trans-species.
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From infancy, chimps are groomed, chiefly by their mothers. They in turn clutch their mothers’ fur from the moment of their birth. The infant revels in the physical contact, deriving deep and long-term psychological benefits from it. Even if their physical needs are attended to, monkeys and apes that, as infants, don’t receive something like hugging and grooming, grow up to be socially, emotionally, and sexually incompetent. As the infant matures, grooming behavior is slowly transferred to others. Most adults have many grooming partners. In a grooming pair, one partner mainly does, the other is mainly done to. But even the alpha will play either role. One individual will sit serenely while the other combs through its hair, rubs all its parts, and occasionally finds a parasite (a louse or a tick—maybe getting ripped on butyric acid), which it promptly eats. Sometimes the chimps hold hands the whole time. Jittery full-grown males will return to their mothers to be groomed and reassured. Males who become irritable with one another often hastily repair to mutual grooming to calm each other down. It may have been selected for long ago, as an improvement in chimp hygiene and public health, but grooming has now become a centrally important social activity, probably lowering testosterone and adrenaline titers.