Tag: tactical deception

  • Deception in Animals: Which Species Lie and What That Tells Us About Cognition

    A male mourning cuttlefish wants to mate with a female. A rival male is watching. The cuttlefish does something that should be impossible for a creature with a 10-month lifespan and no social upbringing: he splits his body display in half. On the side facing the female, he shows courtship coloration — bright, patterned, unmistakably male. On the side facing the rival, he simultaneously displays female patterning — muted, cryptic, a disguise designed to convince the rival that no competition is present. Two contradictory signals, broadcast from one body, targeted at two different audiences at the same time. That’s not camouflage. That’s not instinct in any simple sense. That’s an animal producing a lie calibrated to two different observers with two different perspectives, and executing it in real time with chromatophores instead of words.

    The question of whether animals deceive each other is settled — they do, constantly, across hundreds of species. The question that matters is what kind of deception they’re performing, because the answer tells you something fundamental about what’s happening inside their nervous systems. And a May 2025 paper in Trends in Ecology & Evolution by Drerup, Garcia-Pelegrin, Clayton, and colleagues just reframed the entire field by proposing cephalopods — not primates, not corvids — as the ideal model organisms for studying the most cognitively demanding form of deception.

    The spectrum

    Not all deception is created equal, and the distinctions matter more than the examples. At the bottom of the spectrum, you have deception that requires no cognition at all. Harmless butterflies evolving wing patterns that mimic toxic species is deception — it communicates false information to predators — but nobody claims the butterfly is “lying.” The misinformation is encoded genetically over evolutionary time, not produced by an individual making a decision. A stick insect that looks like a twig is deceiving every bird that passes without doing anything except existing. This is deception without a deceiver.

    One step up, you get deception that involves behavioral flexibility but may still be conditioned rather than cognitively strategic. Firefly femmes fatales — females of the genus Photuris that mimic the flash patterns of Photinus females to lure Photinus males close enough to eat them — produce species-specific flash codes that attract prey. The behavior is adaptive, it’s flexible (the predator adjusts flash timing to match different prey species), but it may operate through relatively simple learning mechanisms rather than any representation of what the victim “believes.”

    At the top sits tactical deception — deceptive behavior that is flexibly adjusted based on the identity, perspective, or inferred knowledge of the observer. This is the category that implies something approaching theory of mind, the capacity to understand that another individual’s knowledge or perspective differs from your own and to exploit that asymmetry. Tactical deception has been documented primarily in two vertebrate groups: primates and corvids.

    The primate evidence

    Primates are the best-studied tactical deceivers. Research across 18 species has demonstrated a strong correlation between the frequency of tactical deception and the size of the neocortex — suggesting that the capacity to deceive conspecifics was itself a selection pressure driving brain evolution, a hypothesis known as the Machiavellian intelligence theory. Chimpanzees suppress food calls when dominant individuals are nearby, concealing discoveries rather than sharing them. Subordinate males lead dominant rivals away from hidden food by walking confidently in the wrong direction, then doubling back to retrieve it when the dominant is out of sight. Baboons have been observed using false alarm calls — predator warnings issued when no predator exists — to scatter competitors away from food resources.

    The key distinction is context-dependence. A chimpanzee doesn’t suppress every food call — she suppresses them selectively, when a specific dominant individual is present and when the social cost of sharing outweighs the benefit. The behavior varies with audience, which means the animal is tracking who knows what, who can see what, and what the consequences of being detected are. Whether that constitutes genuine “mind-reading” or a sophisticated learned association between behavioral cues and outcomes is the debate that has occupied comparative cognition researchers for decades. The behavior looks like theory of mind. Proving it is theory of mind rather than behaviorally flexible conditioning is extraordinarily difficult, because the observable output is identical.

    The corvid evidence

    Corvids — jays, ravens, crows — match primates in deceptive sophistication despite being separated by 320 million years of evolution. Nicola Clayton’s lab at Cambridge has produced some of the field’s most striking results. Western scrub-jays that have been observed caching food by another jay will return later, when the observer is absent, and re-cache the food in a new location — but only if the cacher has personal experience of having stolen food from others. Jays that have never stolen don’t re-cache. The implication is that the cacher is projecting its own experience of thievery onto the observer — reasoning, in effect, “I would steal from that cache, so this jay probably will too.”

    Ravens observed by Thomas Bugnyar show similar patterns. They monitor the gaze direction of competitors during caching events and adjust their concealment strategies based on whether they believe the competitor has visual access to the cache location. A 2016 study demonstrated that ravens can track whether an observer can see through a peephole — adjusting their caching behavior based on whether the peephole is open or closed, even when no actual observer is present. The researchers argued this showed an understanding of another’s visual perspective independent of behavioral cues, though the interpretation remains contested.

    Garcia-Pelegrin’s work at Cambridge has added another dimension: using magic tricks as experimental tools. Jays were shown sleight-of-hand coin vanishes and real transfers. The birds tracked the real transfers accurately but were fooled by the sleights — demonstrating that they form predictions about object permanence and manual actions that can be violated, just as human audiences are fooled by the same techniques. The cognitive architecture that makes you susceptible to a magic trick is the same architecture that allows you to deceive others.

    The cephalopod frontier

    The 2025 Drerup et al. paper in Trends in Ecology & Evolution argues that cephalopods — octopuses, cuttlefish, and squid — are the ideal organisms for studying tactical deception because they combine two things no other taxon offers at the same scale: an extraordinarily rich behavioral repertoire of naturalistic deception and cognitive abilities sophisticated enough to potentially support flexible, audience-dependent deployment.

    The mourning cuttlefish’s split-body display is the poster case, but it’s not the only one. Common cuttlefish flash false eyespots to scare approaching predators — but only to visually oriented predators, not to those that hunt by smell, suggesting the behavior is calibrated to the sensory capabilities of the audience. Giant Australian cuttlefish males that are too small to win fights adopt female coloration and posture to sneak past rival males and access females — a transient, context-dependent mimicry that is abandoned the moment the social environment changes. Female opalescent squid mimic male appearance by flashing a white stripe to deter unwanted mating attempts, deploying the deception only under specific conditions.

    The critical question the paper raises is whether these behaviors constitute conditioning — learned responses to specific cue-outcome pairings — or tactical deception, which requires the deceiver to evaluate information about the observer and adapt its strategy based on the observer’s perspective. The distinction matters because cephalopods have nervous systems organized completely differently from vertebrates — 500 million neurons in an octopus, most distributed across peripheral ganglia in the arms rather than concentrated in a central brain. If cephalopods perform tactical deception, it evolved independently from the primate and corvid lineages, through entirely different neural architecture, which would tell us something profound about what kinds of nervous systems can support perspective-taking and flexible social cognition.

    What deception tells us about minds

    The ability to lie is — paradoxically — one of the strongest indicators of cognitive sophistication. A truthful signal requires only a detection system and a broadcast mechanism. A deceptive signal requires, at minimum, a model of what the receiver expects, an ability to generate a signal that violates reality while matching that expectation, and — in the case of tactical deception — a capacity to adjust the deception based on who’s watching. Every step up the deception spectrum adds a layer of cognitive complexity that brings the deceiver closer to what we’d recognize as a mind.

    The convergent evolution of tactical deception in primates, corvids, and potentially cephalopods — three lineages separated by hundreds of millions of years and running on radically different neural hardware — suggests that the capacity for deception isn’t a quirk of primate brains. It’s a solution that evolution converges on whenever social complexity creates enough pressure to make manipulating others’ behavior worth the cognitive investment. The cuttlefish that splits its body display between two audiences and the chimpanzee that leads a rival away from hidden food are solving the same problem with different equipment. The problem is other minds. The equipment is whatever nervous system natural selection had to work with.

    We cover deception alongside mirror neurons, dolphin naming, tool use, and 20 other investigations into what animal nervous systems can do across our Animal Culture & Knowledge course — where the question isn’t whether animals have minds but what kind of minds they have, and how we’d know.

  • Baboon Politics: Social Hierarchies, Alliances, and Machiavellian Intelligence in Primates

    A baboon can do something that most humans find cognitively demanding and many find socially impossible: induce a more powerful individual to attack a third party on its behalf, without the powerful individual realizing it’s being used as a weapon. The maneuver is called a “protected threat.” The baboon appeases the dominant member of its group, positions itself to make a subordinate appear threatening, and maneuvers to prevent the target from doing the same thing in reverse. It’s social tool use—using another organism as an instrument to achieve a goal—and baboons master it at puberty. Chimpanzees, by comparison, don’t learn to use a stone to crack nuts until adulthood. Primates appear to manipulate social objects with more sophistication and at earlier developmental stages than physical tools, which raises an uncomfortable question about what primate brains actually evolved to do.

    The answer, according to a hypothesis that has shaped comparative cognition for nearly four decades, is politics.

    The Machiavellian intelligence hypothesis

    In the 1960s, lemur researcher Alison Jolly noticed something counterintuitive. Lemurs were terrible at manipulating objects—far worse than monkeys at the mechanical problem-solving tasks that laboratories used to measure intelligence. But their social skills were just as sophisticated as monkeys’. Jolly proposed reversing the common assumption: instead of social complexity being a product of intelligence, intelligence might be a product of social complexity. The technical challenges of foraging—finding food, processing it, remembering where it grows—might matter less than the social challenges of living in permanent groups with dozens of individuals who are simultaneously your allies, rivals, mates, competitors, and kin.

    Psychologist Nicholas Humphrey extended this in 1976. He’d watched captive monkeys handle laboratory puzzles with impressive skill, but he couldn’t find anything comparably challenging in their natural foraging environment. The hardest problem these animals faced, he argued, wasn’t physical. It was social—navigating a group where every interaction involved weighing cooperation against competition, tracking who owes what to whom, remembering past conflicts and predicting future alliances, and doing all of this with individuals who are simultaneously doing the same calculations about you.

    Frans de Waal’s 1982 book Chimpanzee Politics documented the social maneuvering of chimpanzees in terms that read like a dispatch from the Florentine court—coalition formation, strategic alliance shifts, betrayals, reconciliations, and the systematic deployment of social favors as a form of political currency. Andrew Whiten and Richard Byrne formalized the concept in 1988 as the Machiavellian intelligence hypothesis: the pressure to outmaneuver other members of your social group is a primary driver of the evolution of primate intelligence. The brain got bigger not because the environment got harder but because the social group got more complicated.

    Robin Dunbar demonstrated a correlation between primate group size and neocortex size—the most recently evolved part of the brain, and the part that expanded most dramatically in the primate lineage compared to other mammals. Larger groups require tracking more relationships, remembering more histories, predicting more behaviors. The cognitive load scales with the number of social connections, not with the complexity of the physical environment. Primates have brains roughly twice as large as expected for mammals of equivalent body size, and the Machiavellian intelligence hypothesis argues that social computation—not tool use, not foraging, not predator avoidance—is the primary reason.

    What baboons actually do

    Baboon troops are not democracies. They’re hierarchies maintained through a combination of aggression, alliance formation, grooming, and the careful management of social relationships that function as a currency more stable than any physical resource. Male baboons compete for rank through direct confrontation, but rank alone doesn’t determine reproductive success. Males who form alliances—particularly with unrelated males—can collectively outcompete higher-ranking individuals. The alpha male is not always the most reproductively successful male. The most politically connected male sometimes is.

    Female baboons form their own hierarchies, typically more stable than male hierarchies and based heavily on kinship. A female’s rank often follows her mother’s, creating lineages of dominant and subordinate families that persist across generations. High-ranking females get better access to food and water, experience lower stress hormone levels, and have offspring with higher survival rates. The fitness consequences of social rank are measurable, heritable, and real.

    Grooming is the central social technology. Baboons groom each other for hours daily, and the distribution of grooming is not random. It correlates with alliance patterns, kinship, and—critically—with what the grooming partner can offer in the immediate social marketplace. Research on wild chacma baboons found that female coalitions were not long-term strategic alliances built through reciprocal grooming over months. They were opportunistic, short-term transactions where both parties benefited immediately. Baboons don’t trade favors across time the way the Machiavellian framework originally suggested. They trade in real time, in a social marketplace where the value of a grooming partner fluctuates based on current social conditions.

    This finding—published by Silk, Cheney, Seyfarth, and others—complicated the original hypothesis significantly. The Machiavellian framework emphasized long-term strategic planning, deception, and reciprocal exchange. The field data suggested something more like a spot market: baboons assessing the current value of social partners and adjusting their behavior accordingly, not executing multi-step schemes that require remembering who did what three weeks ago.

    Tactical deception

    Byrne and Whiten documented tactical deception in baboons—behaviors designed to create false impressions in the minds of other individuals. A subordinate baboon feeding on a preferred food item while a dominant individual approaches will sometimes casually move away from the food and adopt a relaxed posture, as if it had finished eating or hadn’t been eating at all. Once the dominant passes, the subordinate returns to the food. The behavior requires, at minimum, an understanding that the dominant’s behavior is influenced by what it believes about the subordinate’s behavior—a rudimentary form of the social cognition that in humans we’d call theory of mind.

    Mountain gorillas suppress their copulation vocalizations during secretive matings with subordinate males, conducted out of sight of the dominant silverback. Both the female and the junior male remain silent—a coordinated deception that requires both parties to understand that the dominant male’s response depends on what he perceives. When these matings are discovered, the dominant male invariably attacks the female, adding a punitive dimension to the social calculation: the cost of being caught is asymmetric, falling more heavily on the female, which means the decision to mate secretly involves weighing the reproductive benefit against a gendered risk of punishment.

    Dario Maestripieri at the University of Chicago, studying rhesus macaques, found that these monkeys share with humans “strong tendencies for nepotism and political maneuvering.” His conclusion: “Our Machiavellian intelligence is not something we can be proud of, but it may be the secret of our success.” The cognitive machinery that enables a baboon to manipulate a dominant individual into attacking a rival may be the same machinery that, scaled up and elaborated over millions of years, enables a human to navigate corporate politics, negotiate a trade deal, or run for office.

    What the critics found

    The Machiavellian intelligence hypothesis has generated productive pushback. Barrett and Henzi, studying baboons and other primates in the field, argued that the hypothesis overemphasizes exploitation and deception at the expense of tolerance, coordination, and cooperation. Primate social life, they contended, is not primarily a chess game of strategic manipulation. It’s “an intricate tapestry of competition and cooperation, of aggression and reconciliation, of nonaggressive social alternatives, and of behaviors and relationships that cannot be easily categorized into simple opposites.”

    The orangutan problem is frequently cited: orangutans are largely solitary but outperform the highly social baboon on cognitive tests. If social complexity drives intelligence, the most social species should be the smartest. They’re often not. The relationship between sociality and cognition is real but messier than the original hypothesis suggested—group size correlates with neocortex size across the primate order, but individual species frequently violate the pattern.

    The current consensus treats the Machiavellian intelligence hypothesis as an important partial explanation rather than a complete theory. Social complexity is a major driver of primate brain evolution, but it’s not the only driver, and the specific form that social cognition takes—long-term strategic planning versus real-time marketplace trading, deceptive manipulation versus cooperative coordination—varies between species in ways the original framework didn’t predict.

    Why it matters beyond primatology

    The baboon troop is a small-scale version of the problem every human organization faces: how do you maintain a stable group when every member has individual interests that partially conflict with the group’s interests? The baboon’s solution set—hierarchy, coalition, grooming, deception, reconciliation, punishment, nepotism—is recognizable to anyone who has spent time in a corporate office, a political party, or a homeowners association. The specifics differ. The architecture doesn’t.

    The deeper implication is about what brains are for. If the Machiavellian intelligence hypothesis is even partially correct, the enormous human neocortex didn’t evolve primarily to solve physics problems or build tools or develop language. It evolved to navigate other humans—to predict what they’ll do, influence what they think, form alliances that advance your interests, and detect when someone is doing the same to you. The math, the engineering, the art, the philosophy—all of it may be a secondary application of cognitive hardware that was built, under evolutionary pressure, for politics.

    We cover baboon social intelligence alongside chimpanzee tool traditions, dolphin communication, and the full landscape of animal cognition across our Animal Culture & Knowledge course—including why the most revealing thing about human intelligence might be how much of it we share with a monkey that learned to weaponize its friends.