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Wren: Hey there, and welcome to Bird Brains — the show where we take the biggest insult you can hurl at someone and turn it into the highest compliment we know. I'm Wren, ornithologist, lifelong corvid obsessive, and your guide through the surprisingly rich inner lives of crows, ravens, magpies, and jays. Huge thank you to our sponsors today — Ada, who helps clients weave A I into their workflows in genuinely smart ways; Ago Consulting, the silicon development pros taking projects from A I all the way to SoC; and Zen Semiconductor, an umbrella company with a whole portfolio of businesses spanning the silicon industry. We couldn't do this without them. Now — today we're talking about crow brains, crow cognition, and the remarkable, documented, peer-reviewed ways these birds make us question what we thought we knew about intelligence. Stick around. It gets wild. Wren: Alright, let's kick things off with Corvid Cleverness — and I want to start with a story that I think about almost every time I pick up a cup of coffee. Picture a crow. It's got a peanut. But the peanut is inside a hard shell, and the crow can't crack it open with its beak alone. So what does it do? It flies up, drops the peanut onto a road, waits for a car to roll over it and crack it open, then swoops down to collect the goods. Okay, clever. But here's where it gets really clever — crows in Sendai, Japan, documented by researcher Yoshiaki Nihei in the 1990s, weren't just doing this randomly. They were doing it at crosswalks. They'd wait for the light to turn red, drop the nut in the path of traffic, wait for the light to turn green, watch the cars do the work, then wait for red again before they walked — yes, walked — out to collect their meal. They were using traffic infrastructure. Infrastructure built by humans, for humans, repurposed by a bird with a brain roughly the size of a walnut. Wren: And this isn't a fluke. Nut-dropping behavior has been documented across multiple crow populations in urban environments, and it's thought to spread culturally — young crows learn it by watching older ones. That word, culturally, is doing a lot of work there, and I want you to sit with it for a second. Culture. Learning behaviors from others in your social group. Passing knowledge across generations without any genetic instruction. That's something we tend to reserve as a hallmark of human — or at most, great ape — intelligence. And yet here are crows, figuring out that cars are basically very large, very reliable nutcrackers. Wren: What makes this tool use so striking is the planning embedded in it. The crow isn't reacting in the moment — it's sequencing. Wait. Drop. Wait again. Collect. There's an understanding of cause and effect, of delayed reward, of environmental systems. Researchers who study corvid cognition, including the late great Nicky Clayton at Cambridge, have shown again and again that corvids can plan for future states — they can hide food for tomorrow, even accounting for whether other birds were watching when they cached it. A crow that was spied on while hiding a snack will go back later and move that snack when the spy is gone. Let that sink in. That bird is modeling another bird's mind. It knows that the other bird knows. And it acts on that knowledge strategically. Wren: That brings us beautifully into our second thread — How Their Minds Work — because the neuroscience here is genuinely mind-bending, and for a long time it was almost completely overlooked. Here's the thing. For decades, neuroscientists assumed that intelligence in vertebrates required a neocortex — the layered, wrinkled outer structure of the mammalian brain. Birds don't have a neocortex. So the assumption was, well, birds can't be doing anything too sophisticated up there. Case closed. Except — nobody told the crows. Wren: In 2020, two independent research groups published landmark studies showing that corvids — and pigeons, actually, but especially corvids — have neurons in a region of their brain called the pallium that function in ways remarkably similar to the mammalian neocortex. They found evidence of sensory consciousness — the birds appeared to have subjective experience of what they were perceiving. One study, led by Andreas Nieder at the University of Tübingen, trained crows to report what they saw on a screen. The neural activity in their palliums didn't just respond to the stimulus — it tracked the crows' reported experience of the stimulus. In other words, the crows weren't just seeing. They were aware that they were seeing. That is a huge deal. That's the neurological fingerprint of consciousness, and it showed up in a creature whose ancestors diverged from ours about 320 million years ago. Wren: So when people ask, can a bird really be that smart, the answer is — it depends on what you mean by smart, and it definitely depends on whether you're willing to update your assumptions about what a brain has to look like to produce intelligence. Corvid brains are dense. Compact. Extraordinarily efficient. Relative to body size, crows and ravens have brains comparable in proportion to those of great apes. And the wiring, it turns out, achieves similar computational results through a completely different architecture. Evolution found the same solution twice, by two totally different routes. Convergent cognitive evolution. It's one of the most exciting ideas in modern biology, and crows are right at the center of it. Wren: Now, I want to bring in something that's been circulating lately — there's been renewed interest across different cultural and religious traditions in which animals might qualify as truly intelligent, with some writers drawing on both neuroscience and classical texts to talk about corvids. The crow and the raven show up in an extraordinary number of traditions as symbols of wisdom, memory, and foresight — Norse mythology gives us Odin's ravens Huginn and Muninn, whose names literally mean Thought and Memory. Indigenous traditions across North America treat Raven as a trickster-creator, a being of transformation and cunning. And it turns out those ancient intuitions weren't wrong. The people who lived alongside these birds, who watched them every day, saw something real. Science just took a while to catch up. Wren: Alright — let's land this plane with my favorite segment, Corvids and People, because this is where things get warm and a little bit wonderful. I want to tell you about a girl named Gabi Mann, who made international news around 2015. Gabi lived in Seattle, and she'd been feeding the crows in her backyard since she was about four years old — mostly accidentally, dropping bits of food and noticing the crows were paying attention. As she got older, she started feeding them deliberately. Crow after crow started showing up. And then something strange began to happen. The crows started leaving things for her. Wren: Not random things. Small objects. A button. A piece of blue glass. A miniature silver ball. A hinge. A Lego piece. A small piece of metal with the word "best" printed on it. Gabi kept them all in a special box, labeled and catalogued like a naturalist's collection. The most prized item — and this is documented — was a pearl-colored heart, found on a bird bath the day after Gabi had been particularly generous with the crows. Now, researchers are careful here. John Marzluff at the University of Washington, one of the world's leading crow scientists, has studied reciprocal gift-giving behavior and notes that while crows clearly do bring objects to people who feed them, we should be cautious about projecting human gift-giving intentions onto the behavior. But the behavior itself? Documented. Repeated. Cross-cultural. There are similar accounts from Japan, from the UK, from all over. Wren: What we do know is that crows recognize individual human faces — Marzluff's own research demonstrated this by having people wear masks while trapping and banding crows, and then walking around campus in those masks later. The crows mobbed and scolded the masked faces for years afterward, even teaching younger crows who had never even seen the original trapping to scold that mask. They hold grudges. Across generations. They also remember kindness. There's strong evidence that when a crow brings you a shiny object, it's at minimum a behavior that emerges from an ongoing, recognized relationship — that crow knows your face, knows your routine, knows you feed it. Wren: Think about what that means. There is a wild animal in your city — not a pet, not trained, not domesticated — that has looked at your face, filed it away, and made a decision about how to interact with you based on your history together. It has a relationship with you. And sometimes, apparently, it brings you a small piece of blue glass to say thank you. I don't know about you, but I find that almost unbearably moving. Wren: There's a certain kind of mind that looks at the world and sees only what it already expects to find. And then there's the kind that watches a crow wait at a crosswalk, or leave a button for a little girl, or move a hidden walnut because it clocked another bird watching — and thinks, wait. What else have I been missing? That's the question Bird Brains is here to keep asking. Big thanks again to our sponsors — Ada, Ago Consulting, and Zen Semiconductor — Bird Brains is brought to you by Ada, Ago Consulting, and Zen Semiconductor, and we are so grateful for their support. If this episode made you see the crows on your street a little differently, please subscribe, leave a review, and share it with someone who needs their assumptions cheerfully upended. Full sources and further reading are at the link in show notes. Stay curious out there — and remember, being called a bird brain? Honestly, at this point? That's a compliment.