The Primate Myth: Why the Latest Science Leads Us to a New Theory of Human Nature

by Jonathan Leaf

Challenging everything we thought we knew, this book takes a revolutionary look at how humans are far less like other primates than we’ve been led to believe—and uncovers what truly sets us apart.

Humans are primates, much like chimps—or so we’ve been continually told. Yet recent discoveries show that our species has a different brain design, function, and chemistry; different eating, sleeping, mating, and rearing patterns; a different metabolism; and a different physiology than apes. Nor is our behavior much like theirs, and we don’t even have the feet made for climbing trees that define the primate order.

Could it be that conceiving of ourselves as primates isn’t helping us understand what it is to be human? By examining the latest research in neuroscience and genetics, we are propelled toward a radically different conception of our nature. In this way, we can begin to grasp the distinctively human dimensions of war, murder, suicide, and homosexuality, along with our fascinations with subjects like sports, politics, and fashion. Here is the path by which to understand our species’ essential problems and uncover the answers for how we should live our lives.

Genres: Nonfiction

320 pages, Paperback

Published October 21, 2025

Reviews

[Stetson · Rating 1 out of 5]

This is a ludicrous book claiming humans are a "herd" species. This is not a taxonomic classification but rather a term from ethology, the study of animal behavior. Herding, schooling, or flocking are observed across taxa. He argues that convergent evolution accounts for the many similarities between humans and other animal species like Cetaceans, but this is a mixture of category error and question begging.

Leaf's argument here is so poor it approaches "not even wrong" territory because it is comprised of a series of classification errors that arise from deep misinterpretations of public rhetoric about primatology. Primatology isn't a field that exists to entirely explain human behavior. It simply provides an opportunity to compare and contrast given that the nearest extant species by phylogenetics (something the author never challenges because it would be obviously stupid to do so) to Homo sapiens are other primates, namely Chimpanzee who share a common ancestor 6-8 mya (probably toward the later portion of that window given new evidence). Primatology has also long been a field that's faced invited and uninvited politicization, which is a function of the public wholly accepting a Darwinian and sociobiology frame.

And yes, 8 mya is a lot of time for evolution to write changes into the genome (like bipedalism, guts optimized for cooked meats, pair bonding, self-domestication, intelligence, and cooperation), and these changes are known (e.g. chromosomal fusion forming human chr 2 or HARs), but Leaf mostly confines his argument for taxonomically distancing humans from other primates simply on the basis of morphology (no prehensile feet in humans) and behavior (war, suicide). Yet, he hardly engages in comparing sapiens to other known hominids, conveniently overlooking issues created for his argument by Naledi or the extent of interbreeding between sapiens and Neanderthals/Denisovans.

Anyway, Leaf is actually trying to do rhetorical messaging ("don't let the scientist tell you we're like primates!" - meaning being homicidal, antisocial, selfish, hierarchical, polygynous) rather than science ("We obviously share some important physical and behavioral similarities with our extant cousins, and the difference can also be illuminating when we can demonstrate how and why they exist."). So none of this is a real attempt at inquiry nor is it going to be one. The direction of all the relevant academic fields is to try to emphasize how hardly any human adaptation is special or distinctive, which is also wrong-headed, but it is often more empirically and theoretically defensible compared to whatever Leaf thinks he's up to here.

[Will Meyerhofer · Rating 5 out of 5]

I love books like this: smart, full of science and crisply and entertainingly written, with plenty of fresh synthesis and a-brim with ideas. Leaf's big idea is obviously on-target with contemporary thinking among scientists breaking new ground in the related fields, and this popular presentation is overdue. Yes, humans broke away from apes and monkeys and other primates a long time ago, and while we're closest to primates in certain respects (mostly simply that, if you go back far enough, our evolutionary paths converge), in other vital ways we're closer to analogs from other evolutionary families, such as dolphins and elephants. The ramifications of that big idea are what makes this such a hard book to put down because it all gets at that big question, what does it mean to be human, and how and why. I won't give anymore away - just give it a read. The prose sails by, but the ideas are so interesting you might find yourself walking up to your spouse in the kitchen to tell them something you just learned that you felt compelled to share and discuss. It's that kind of book. And I love those kinds of books.

[Dylan · Rating 5 out of 5]

A real pleasure to read, and it moves at a great clip while still being digestible. The book certainly gives you a lot to think about and makes very compelling arguments. If we are going to think of man as just another animal, then it is important to consider the proper animals, and the case Leaf makes will have you considering elephants and horses differently. I suspect Leaf considers man as more than an animal, but the case he lays out here is largely agnostic and can be reasonably debated regardless of your metaphysical priors.

[Jjmom · Rating 4 out of 5]

I'm glad I ran across the author and decided to read his book


I originally thought this book was going to promote "intelligent design" or something, but I found out otherwise when I heard the author interviewed on a podcast, so I decided to read it. He made an interesting case for placing humans into a separate taxonomic family from the great apes based on behavior, physiology and some interesting scientific research.

He lost me with his romantic ideas about women being the solution to ending wars, though, e.g., "By creating democracies in which women have a voice, we have stopped wars and set aside those capable of manipulating us into them. That is the path to ending war." (Hello? Hillary Clinton bombing Libya?). Today, some like Helen Andrews argue that we've swung too far toward feminization, leading to cancel culture, censorship, emotional rather than logical data driven arguments, and pervasive HR "karen" mindset ("Everything you think of as “wokeness” is simply an epiphenomenon of demographic feminization." ~J. Stone).

The cover art seems to contradict the thesis of the book and was unpleasant to look at. To open the book, I had to tap quickly while averting my eyes.

[Michele Wucker · Rating 5 out of 5]

The ideas and insights in this thought provoking book will stick with me for quite a while. I learned so much about how different various primates are from humans and from each other and how much more humans resemble other species than I had considered before. I highly recommend THE PRIMATE MYTH to anyone who likes to challenge underlying assumptions -especially those you may not even have realized you had.

[Linda Griffin · Rating 5 out of 5]

Yes, I'm convinced that humans are domesticted pack animals, not primates, but the book is most interesting when Leaf is not belaboring that point.