Bumble Bees Solve an Insect Version of a Famous Primate Intelligence Test - SciTechDaily

June: Welcome to Kindred Minds — I'm so glad you're here. I'm June, a primatologist and storyteller, and every episode I bring you true stories about our primate relatives that I think will genuinely surprise you, move you, maybe even change the way you see yourself a little bit. June: Today's episode is a good one. We've got wild orangutans doing something with their voices that we thought only humans could do, a fascinating new challenge to one of the oldest assumptions in brain science, and a story about forests, primates, and why protecting one means protecting the other. There's a thread running through all of it — this deep, persistent, beautiful similarity between us and them. Stick around. June: A huge thank you to our sponsors who make this show possible. Ada helps companies integrate A I into their real-world workflows in ways that actually work — thoughtful, practical A I integration. Ago Consulting — pronounced "Ahh-Go" — are silicon development experts, working across everything from A I to full System-on-Chip design. And Zen Semiconductor, an umbrella company with a whole portfolio of businesses spanning the silicon industry. We're grateful for all three. Now — let's get into it. June: So let's start with something that genuinely stopped me in my tracks this week. Researchers have been studying wild orangutans in the forests of Sumatra and Borneo, and what they found in the way these animals communicate is — well, it rewrites something we thought we knew about ourselves. June: For a long time, there was this idea in linguistics and cognitive science that layered communication — meaning the ability to stack signals, to combine calls in ways where the combination means something different from any single part — was a uniquely human thing. It was one of those invisible fences we drew around ourselves. We said: animals have signals, but humans have language, and language has this combinatorial richness that nothing else in nature quite matches. June: And then the orangutans said — hold on a moment. June: What the researchers observed was that wild orangutans aren't just making individual calls. They're combining vocalizations in structured, layered ways. And crucially, those combinations carry meaning that the individual calls don't carry on their own. That is — by any reasonable definition — a form of compositional communication. The kind of thing we thought was ours. June: Now, I want to be careful here, because the scientists are careful. They're not saying orangutans have language the way you and I are having a conversation right now. But they are saying that the cognitive and communicative architecture that allows for this kind of layering — this stacking of meaning — appears to have much, much older evolutionary roots than we assumed. June: Think about what that means. If orangutans, who diverged from our ancestral line somewhere around twelve to fourteen million years ago, already have this capacity — then the seeds of what became human language were being planted enormously far back in time. This wasn't something that appeared suddenly in Homo sapiens. It was there, waiting, evolving slowly across millions of years of primate life. June: I find that humbling in the best possible way. It means language isn't this miraculous gift that dropped into our laps. It's something our whole family was working toward. Orangutans just show us a version of it — a wild, forest-dwelling, tree-canopy version — that predates us by an almost incomprehensible stretch of time. June: Orangutans are already fascinating for so many other reasons. They are the most solitary of the great apes. They spend most of their lives in the canopy, they have extraordinarily long childhoods — up to eight years with their mothers — and during that time, they learn. They watch, they practice, they absorb. The culture of their group passes from mother to offspring over years of close contact. And now we're learning that what's passing between them vocally is far richer than we knew. June: There's something about orangutans specifically that I think gets overlooked in the public imagination. We tend to talk about chimpanzees and bonobos when we talk about primate intelligence — partly because they're our closest relatives. But orangutans are doing something extraordinary in their own right. Alone in the treetops, shaping meaning with sound, in forests that have been shrinking around them for decades. June: That detail matters, and we'll come back to it. But first — let's talk about brains. Because there is a very old assumption in science that bigger brains mean smarter animals, and a new study has something very direct to say about that. June: For a long time — and I mean a long time, like Victorian-era long — scientists assumed that absolute brain size, or at least brain size relative to body size, was the key predictor of intelligence across species. Bigger brain, more cognitive power. It seemed intuitive. It seemed tidy. And for a while, it seemed to hold up reasonably well. June: But here's the problem: the more carefully researchers have studied primate cognition, the messier that story has gotten. And now a study published in recent weeks — looking specifically at primates — has made it pretty direct: brain size does not reliably predict cognitive performance in primates. Not absolute size. Not relative size. Not the ratio. The correlation just isn't there the way we thought it was. June: This is a big deal. Because what it suggests is that intelligence — real, flexible, problem-solving intelligence — isn't simply a matter of having more neurons packed into a bigger case. It's about how the brain is organized. How the circuits are wired. What structures are emphasized. June: And this connects to something that I think is deeply relevant to understanding ourselves. We humans have large brains, yes. But some of what makes human cognition distinctive isn't just size — it's the disproportionate development of specific regions. The prefrontal cortex, which handles planning and decision-making and impulse control. The regions supporting language. The social brain networks that let us read each other's intentions and build complex cooperative relationships. June: What the primate brain-size study points toward is that across our whole order — the primates — what matters is the shape of the intelligence, not just the volume of the container. And that means small-brained primates can be doing genuinely sophisticated things that we'd miss if we were only measuring their skulls. June: Which brings me to something delightful that happened in insect science this week — yes, insect science, stay with me — because it has everything to do with this point. June: Bumble bees — fuzzy, round, improbable little creatures — were recently tested on a cognitive challenge that is essentially an insect version of a classic primate intelligence test. The kind of test where you have to learn a rule, and then apply that rule to a completely new situation you've never encountered before. That's called transfer learning, and it's considered a hallmark of flexible intelligence. June: And the bumble bees passed. June: Now, the brains of bumble bees are — I mean, they are tiny. A million neurons, roughly. For context, you have about eighty-six billion. And yet these bees, with their miniature nervous systems, performed the kind of abstract reasoning that we typically associate with primates. With us. June: The lesson here isn't that bees are as smart as chimpanzees — they're not, the tasks are different, the contexts are different. The lesson is that intelligence is not a single ladder with humans at the top. It's more like a forest — every species has evolved the cognitive tools it needs for its particular niche, and some of those tools are astonishingly sophisticated in creatures we never expected. June: The primate brain-size findings and the bee findings land in the same place: don't judge cognitive capacity by the size of the container. Look at what the animal actually does. Watch them solve problems. Watch them communicate. Watch them make decisions under pressure. That's where the real story is. June: And speaking of the real story — let's talk about the biological recipe. Because I think this is the part that, once you really feel it, changes everything. June: We share roughly ninety-eight point seven percent of our D N A with chimpanzees. You've probably heard that number before. But I want to take a moment with it, because I think we often hear it and nod and move on without letting it actually land. June: That means that if you printed out the entire human genetic code — all three billion base pairs of it — and compared it letter by letter to a chimpanzee's, you would find differences in only about one letter in every hundred. One percent. The recipe for building a chimpanzee and the recipe for building a human are almost identical documents. June: We share the same basic body plan. The same organ systems. The same fundamental brain architecture. Chimpanzees have a prefrontal cortex — smaller than ours, but structurally the same. They have the same emotional circuitry — the amygdala, the regions that process fear and pleasure and social connection. When a chimpanzee mother holds her infant, the neurochemistry of that bond — the oxytocin, the dopamine, the cortisol responses — mirrors what happens in a human mother holding her baby. June: With gorillas we share about ninety-eight point three percent of our D N A. With orangutans — our tree-dwelling, vocally complex cousins from Sumatra and Borneo — around ninety-six to ninety-seven percent. With gibbons, with the Old World monkeys, with the New World monkeys — the percentage steps down, but the shared heritage remains. We are all reading from variants of the same ancient text. June: And this matters for more than just the philosophy of it. It matters for medicine. It matters for understanding disease — why certain viruses jump species, why certain drugs work across mammals, why the primate research that has been done, ethically or not, has shaped so much of what we know about the human body. June: It matters for understanding the orangutan's layered calls — because those calls are being produced by a vocal tract, a nervous system, and a social brain that are all built from instructions that are recognizably, undeniably related to our own. June: We didn't invent cognition. We inherited it. And we share it — in different forms, at different depths — with every other primate alive today. When we look at them, we are looking at family. Not metaphorically. Biologically. Literally. The same recipe, written in slightly different handwriting. June: Alright. I want to close today with something that connects all of this to the world we actually live in — and to why it matters that we pay attention. June: There's a study that came out recently — actually, let me just sit with the finding for a moment before I contextualize it, because it is striking. Researchers looked at forests around the world and found that protecting primate populations doesn't just protect those animals. It safeguards the health and integrity of entire forest ecosystems. June: And when you think about how primates live, this makes complete sense. Primates are seed dispersers. They eat fruit and travel — sometimes enormous distances — and deposit seeds far from the parent tree. In tropical forests especially, primates are essential to the regeneration of tree diversity. Some large seeds — the kind that come from large, slow-growing, carbon-storing trees — can only be dispersed by large animals. Large primates. If you lose the primates, you don't just lose the animals. You lose the forest's ability to rebuild itself. June: Researchers have estimated that in some tropical ecosystems, losing primate populations could reduce the forest's carbon storage capacity significantly. These animals are not just living in the forest. They are, in a very real sense, making the forest. June: And here's where the invisible gorilla comes in — because there was a fascinating study revisited recently at New York University, drawing on the famous psychology experiment. You might know it: participants watching a video and asked to count basketball passes completely miss a person in a gorilla suit walking through the scene. It's been one of the most famous demonstrations of inattentional blindness — the way our focused attention can make us literally not see what's right in front of us. June: The new research revisited and refined what we understand about this phenomenon. And I keep thinking about it as a metaphor — not just as science. Because how many of us have been inattentionally blind to the primates around us? To the fact that forests are disappearing. To the fact that we are losing our relatives — real, breathing, communicating, feeling, seed-dispersing relatives — and we're not seeing it because our attention is elsewhere. June: I think of the orangutans. The ones being studied in Sumatra and Borneo right now, the ones whose vocal complexity is only just being understood. Those forests — the ones those orangutans are making with their seed dispersal, the ones echoing with their layered calls — have lost an enormous portion of their cover in recent decades. Largely to palm oil. To logging. To agricultural expansion. June: And these are not abstract animals. These are animals with long childhoods, with cultural knowledge passed from mother to child over years, with communication systems more complex than we knew. They lose habitat, they lose cultural lineages. Whole bodies of knowledge — which trees to eat from, which calls to make in which sequence, how to build a sleeping nest, how to navigate a landscape — disappear with the individuals who carry them. June: That's not so different from what happens in human communities when language is lost, when elders die before they can teach. The parallel is not a stretch. It's biology. June: But I want to leave you with something that isn't just grief. Because there is real, documented, on-the-ground conservation work happening for primates right now. There are reserves, there are community-based protection programs, there are researchers who have spent their entire careers not just studying these animals but fighting for their survival. And the science is making the case in new and powerful ways — if you protect the primate, you protect the forest. If you protect the forest, you protect the climate systems that all of us depend on. June: This is not a story about animals over here and humans over there. It is a story about one living world, one shared recipe, one family of minds trying to persist together on the same planet. June: That's what Kindred Minds is about. Not that primates are almost human — that framing still puts us at the center. But that intelligence, feeling, communication, culture, family bonds — these are not our inventions. They are life's inventions. And we share them. June: Intelligence and feeling are not ours alone. We share this planet and this family with creatures who are, in every biological sense that matters, our kin. And paying attention to them — really seeing them — is one of the most important things we can do right now. June: Kindred Minds, brought to you by Ada, Ago Consulting, and Zen Semiconductor. Thank you to all three for making this show possible. June: If today's episode moved you or surprised you or made you think — please share it with someone. Subscribe wherever you listen, leave a review if you have a moment, and check the link in show notes for sources, further reading, and the research behind everything we talked about today. June: Stay curious. Stay connected. And I'll see you next time.