Ravens Might Communicate Through Gestures - The Mary Sue

Wren: Hey there, and welcome to Bird Brains — the show where "bird brain" is absolutely, one hundred percent a compliment. I'm Wren, ornithologist, corvid obsessive, and your guide into the surprisingly rich inner lives of crows, ravens, magpies, and jays. Big thank you to today's sponsors — Ada, who helps businesses weave A I into their workflows in ways that actually make sense; Ago Consulting, silicon development experts taking you all the way from A I to SoC; and Zen Semiconductor, an umbrella company with a whole portfolio of companies across the silicon industry — we love a company that thinks in systems, and honestly, so do corvids. Speaking of which — today we've got a story about ravens that might just change how you think about animal communication, we're diving into some jaw-dropping tool construction by New Caledonian crows, and we're talking about a corvid research lab at Cambridge that's closing its doors — and what that means for some very smart birds and the science they've helped shape. Let's get into it. Wren: Okay, so let's kick things off with CORVID CLEVERNESS — and I mean, where do we even start this week, because the tool-use story out of New Caledonia is genuinely one of those moments where you put down whatever you're holding and just stare at the ceiling for a minute. New Caledonian crows — if you're not familiar — are already the rock stars of the tool-using bird world. They live on this island archipelago in the South Pacific, and for decades researchers have documented them fashioning hooks and probes out of twigs and leaves to fish out insects from bark. That alone is remarkable. Most animals, even smart ones, pick up a tool and use it. These crows make them. There's a difference. But researchers publishing in Scientific Reports took things a step further, and what they found is that New Caledonian crows don't just make tools — they make compound tools. As in, they combine multiple separate components to build a single, functional tool. Think about that for a second. You're not just grabbing a stick. You're looking at a stick, looking at another piece, thinking "if I put these together, I get something longer, something better," and then doing it. That is planning. That is means-end reasoning. That's the kind of cognitive leap that, for a very long time, we told ourselves was uniquely human territory. And here's what gets me every time I come back to this research — these birds have never been shown how to do this. There's no crow parent demonstrating compound tool assembly like some kind of avian woodworking class. They figure it out. Researchers tested this by giving crows individual elements that were useless on their own — too short to reach a reward — but that could be combined into a tool long enough to do the job. And the crows, without being explicitly trained, worked out that the pieces could connect. Now, not every crow solved it, and that's actually important context — science is always about populations and probabilities, not magic. But the ones who did? They did it in ways that suggest genuine insight, not just trial and error. They'd often pause, look at the pieces, and then assemble them — what researchers describe as a pattern consistent with "aha moment" problem solving rather than random tinkering. I love that. A crow, having an aha moment. Because why wouldn't they? Wren: And that brings us beautifully into our second thread — HOW THEIR MINDS WORK — because understanding what New Caledonian crows are doing with those compound tools requires us to talk about what is actually going on inside a corvid brain, and I think this is where people's minds really get blown. Because when most of us picture a "smart" animal brain, we picture something that looks like ours. Big, wrinkly, lots of cortex. Corvid brains are small. They don't have a neocortex the way mammals do. And for a long time — a long, embarrassing time in science, honestly — that was kind of the end of the conversation. Small brain, no cortex, therefore not capable of complex thought. Case closed. Except — and here's where it gets wonderful — it was absolutely not case closed. What researchers discovered is that birds evolved a completely different neural architecture to accomplish similar cognitive feats. The region in bird brains called the pallium, and particularly a structure called the nidopallium caudolaterale — I know, I know, say that three times fast — functions in ways that are strikingly analogous to the prefrontal cortex in mammals. The prefrontal cortex is the part of your brain doing your planning, your impulse control, your ability to hold a goal in mind while you work through steps to reach it. Corvids have a version of that. It's just built differently. Which is a gorgeous example of convergent evolution — nature finding the same solution through completely different pathways. And this brings me to the Cambridge story, which genuinely made me a little sad when I read it. The corvid research lab at Cambridge — which has been home to some genuinely landmark work on corvid cognition — is closing. And when a lab like that closes, it's not just researchers who need to find new homes. It's the birds themselves. The corvids who've lived in that research environment, who've been part of studies, who've built relationships with the people caring for them — they need to be rehomed thoughtfully, because these are intelligent, social animals with individual personalities and histories. It's a reminder that when we invite these birds into scientific partnership with us, we take on a real responsibility to them. The Cambridge lab has contributed enormously to what we know about how corvids think — including foundational work on their episodic-like memory, on how jays plan for the future, on their theory of mind. That work doesn't disappear. But losing an institution that's been dedicated to this for years — that's a real loss for the field, and I hope the birds land somewhere wonderful. Wren: Alright, let's get into our third thread — A CORVID-AND-PEOPLE STORY — and this week I want to talk about ravens and gestures, because there is new research suggesting that ravens communicate through deliberate, referential gestures — and if that doesn't make the hair on your arms stand up a little, I don't know what will. The work, covered recently in The Mary Sue, builds on a growing body of evidence that ravens use gestures — specifically showing and offering objects — to communicate with each other and with humans. Now, referential gesturing is a big deal. When you point at something, you're not reacting to it, you're communicating about it to someone else. You're bridging your mind and another mind. Researchers had long thought this kind of communication was largely a great ape thing — something that required our particular kind of social cognition. But ravens have been observed holding up objects — a moss clump, a stone, a piece of bark — apparently to get another raven's attention, to show them something, to share an experience. And these gestures seem to function socially. They're not just about food. Sometimes a raven will present an object to a potential mate, or to a companion, apparently just to engage them. To say, look at this. That is communication. That is social bonding through shared attention, and it maps onto something deeply human in a way that is honestly a little vertiginous if you sit with it. There's a researcher named Simone Pika who has done beautiful work in this area, studying both ravens in the wild and in captivity, and what she and her colleagues found is that these gestures elicit responses from other ravens — turning, looking, engaging — which suggests the communication is genuinely bidirectional. The bird gesturing expects a response. The bird receiving the gesture understands one is being made. That feedback loop — that's dialogue. It's not words, obviously, but it is structured, intentional exchange between minds. And look — I want to be careful here, because animal cognition research requires care. We don't want to over-anthropomorphize. But we also need to stop reflexively under-crediting these animals. The evidence for intentional gestural communication in ravens is building, and it should make us genuinely rethink where the boundaries of language — in the broadest sense — really lie. These birds are out there, in the cold and the wind, holding up a piece of moss to show their partner. That's a relationship. That's a shared world. And that, to me, is one of the most beautiful things in all of science. Wren: So here's where I land every time I do an episode like this one — intelligence is not one thing, in one shape, in one kind of brain. It's this endlessly inventive solution that life keeps finding, over and over, through completely different roads. Crows building compound tools. Ravens sharing objects with each other like gifts of attention. Jays hiding food for a future they're already imagining. These animals are not honorary humans — they're something even more interesting than that. They're proof that minds can bloom in all kinds of bodies, and that the world is far stranger and richer than we usually give it credit for. Bird Brains is brought to you by Ada, Ago Consulting, and Zen Semiconductor — three companies that, in their own ways, are also trying to understand and build intelligence from the inside out. If today's episode sparked something in you, please subscribe, share it with someone who'd love it, and leave a review — it genuinely helps more curious people find the show. All the sources and links for today's stories are in the show notes. Stay curious out there, and remember — bird brain is absolutely a compliment.