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420 pages, Kindle Edition
First published September 2, 2025
Darwin would likely be surprised by human exceptionalism's lingering grip on the public imagination today. But even he foresaw it: "The main conclusions arrived at in this work--namely, that man in descended from some lowly organized form--will, I regret to think, be highly distasteful to many persons." Perhaps we shouldn't be surprised that scientific efforts to assert human exceptionalism redoubled in the decades that followed.
I've often wondered if the implications of Darwinian theory ramped up the human superiority complex. Intriguingly, recent research suggests that human exceptionalism is a worldview we cling to when threatened. The "Ascent of Man" measure was developed by Nour Kteily and colleagues at Northwestern University based on notions of humans rising to the top of a biological hierarchy. In one study, they showed participants the famous image of the five silhouettes proceeding from quadrupedal hominid ancestors to bipedal modern humans. Participants then rated their perceptions of the "evolvedness" of various human groups--such as Americans, Arabs, and South Koreans--listed beneath the image. Kteily found that the presence of threats primed participants to assert their in-group ... as a hierarchically unique or superior form of life. ... The more we are made aware of our vulnerability and threatened by animality, the more we must assert our dominance and superiority. As Melanie Challenger, author of the 2021 book How to Be Animal, points out, "This generates a curious paradox, of course, if we perceive being animal as a threat in an of itself." (pp. 56-7)
...as we've continually defined and redefined what it means to be human, we've excluded certain groups from moral consideration and justified their mistreatment. And the problems with that have never been limited to other species.
Are women human? This question may sound ludicrous today, but it has been asked in some form many times throughout civilization's history. In antiquity, women, foreigners, and others deviating from the dominant white-male Greek ideal weren't actually conceptualized as people at all. ... It was often argued that these subordinate human groups were primarily constituted by their physical bodies rather than by anything rational. Aristotle (in)famously refers to the female character as "a sort of natural deficiency."
This illustrates a fundamental point: the worldview of human exceptionalism has never placed all humans on a par. Rather, it has historically denied full humanity to certain human groups, subordinating others on the basis of their supposedly animal-like qualities. As with the Differential Imperative, this compulsion to demarcate the "human" has sanctioned exploitation along not only species but also ethnic, racial, gender, sexuality, disability, class, and other lines. It's telling that throughout history, human groups thought to lack the attributes in which other species were supposedly deficient--reason, culture, intelligible language, morality, technology, and the like--were considered "subhuman." (p. 68)
My colleagues and I have found not only that chimpanzees console each other following conflicts (a behaviour indicative of empathy) but also that individuals vary markedly in this tendency. ...Research in the wild also suggests that the behaviour may not be universal. One chimpanzee community living in the Mahale Mountains of Tanzania appears to console, while another in the Budongo Forest of Uganda does not.... beyond material cultures (population differences in behaviours like tool use), chimpanzees also have social cultures ... as is the case with humans. ... Too often, we look at chimpanzees as a "species" rather than as the members of diverse communities and individuals that they actually are. Why should this nuanced outlook be reserved for humans alone? (p. 83)
Let's now revisit the common objection that we can never really know what other species experience.... The truth is, we may never be 100 per cent sure. And so it is with all subjective experiences.
...Just imagine being on a boat rocking back and forth as the ocean swells intensify. You go out to the deck for some fresh air and see someone--a total stranger--pale, sweating, and retching. There is good reason to believe that they are seasick, even if they assure you to the contrary. ... Likewise, when a dog yelps after stepping on a wasp, limps, and protects his injured foot, we assume that he experiences something more than a simple, painless reflex....
Of course, there is always the risk that we might misread the behaviour of the individual in question and incorrectly interpret their experience. There are many mysteries in animal (including human) behaviour and being: it's part of the beauty and trouble of living together. But most of the time, it works pretty well. And surely it's better than assuming we can infer nothing about the private feelings of those around us. Yet we seem to require more certainty when it comes to other species. ... That demand for perfection of evidence appears to be a subtle way of adhering to human exceptionalism--a contemporary myth often cloaked in scientific rigour.
According to the founder of cognitive ethology, David Griffin, "The tendency to demand absolute certainty before accepting any evidence about mental experiences of animals reflects a sort of double standard." (pp. 147-8)