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Wren: Welcome back to Bird Brains — the show where we take what's supposed to be an insult and turn it into the highest compliment we know. I'm Wren, ornithologist, crow enthusiast, and your guide to the surprisingly rich inner lives of corvids — that's crows, ravens, magpies, and jays. Today's episode is packed with stories that are going to make you look at the bird on your fence post in a whole new way. We've got tool-using Hawaiian crows that are basically avian engineers, the science of just how smart crows really are, and a story about crows sharing information about dangerous humans — like a neighborhood watch, but with wings. And before we dive in, a big thank you to today's sponsors: Ada, who helps businesses integrate A I into their workflows in smart, practical ways; Ago Consulting — that's "Ahh-Go" — silicon development consultants working across everything from A I to full system-on-chip design; and Zen Semiconductor, an umbrella company with a whole portfolio of businesses across the silicon industry. These are the folks helping us keep the lights on, so we can keep bringing you stories about the animals quietly outthinking us in our own backyards. Alright — let's get into it. Wren: So let's start with thread one — Corvid Cleverness — and I want to take you somewhere specific. I want to take you to Hawaiʻi, to a dense, dripping rainforest on the Big Island, where a crow is doing something that should make your jaw drop. The ʻAlalā — that's the Hawaiian crow, Corvus hawaiiensis — is, by almost any measure, one of the most endangered birds on the planet. There are only a few dozen left, and they exist now largely in managed care and carefully supervised reintroduction programs. But here's the thing — despite being on the brink of extinction, these birds are demonstrating a cognitive ability that only a tiny number of species on Earth possess. They use tools. Not metaphorically. Not accidentally. Deliberately, flexibly, spontaneously using sticks to extract food from places they can't reach with their beaks. Researchers working with captive ʻAlalā found that the birds would pick up sticks, manipulate them — sometimes trimming and shaping them — and use them to probe into holes and crevices to get at hidden food. And this wasn't something they were trained to do. They figured it out. The researchers hadn't coached them. The birds just looked at the problem, looked at the stick, and connected the dots. What makes this even more remarkable is the comparison point. The only other corvid known to do this kind of spontaneous, flexible tool use in the wild is the New Caledonian crow — a species that has become almost synonymous with avian intelligence. And the ʻAlalā sits right alongside them. Mental Floss ran a piece on this, cheekily calling it the bird version of MENSA, and honestly, I don't think that's too far off. These aren't animals acting on instinct in a narrow, hardwired way. They're problem-solving. They're looking at an object in the world, understanding its relationship to a goal, and using it. That's a cognitive leap that most animals — most — never make. And here's what gets me every time I think about this. These crows evolved on an island, in isolation, without any human teaching, without contact with New Caledonian crows, and they landed on the same solution. Tool use. Independently. That's called convergent cognitive evolution, and it's one of the most stunning things in all of animal behavior. The brain — or at least, certain kinds of brains — keep arriving at the same answers. Wren: Alright, thread two — How Their Minds Work — and this is where I want to get into the neuroscience a little, because I think it's genuinely one of the most exciting frontiers in animal cognition right now. For a very long time, the working assumption in neuroscience was that intelligence scaled with brain size, and more specifically, with the size and complexity of the neocortex — that's the wrinkled outer layer of the mammalian brain associated with higher-order thinking. And by that measure, birds should be pretty limited. They have small brains, and for a long time people thought their brains were mostly just glorified reflex centers. Turns out — and I love saying this — we were wrong. The BBC covered this beautifully, citing research that puts crows in genuinely rarefied cognitive company. Studies have shown that crows demonstrate what researchers call "recursive thinking" — the ability to think about thinking, essentially. In one line of research, crows were tested on tasks designed to probe metacognition — knowing what you know. And they passed. They showed behavioral evidence of being aware of their own uncertainty, which is a capacity we associate with great apes and humans. Their brains do this through a completely different architecture than ours. Instead of a layered neocortex, corvids have a densely packed region called the pallium, with a part called the nidopallium caudolaterale that seems to serve analogous functions to our prefrontal cortex — the seat of planning, decision-making, and impulse control. Different wiring. Same output. And beyond the raw neuroscience, crows demonstrate planning behaviors that are frankly humbling. They cache food — they hide it — and they do so strategically. Studies on Eurasian jays, close corvid relatives, have shown that they will re-hide food if they think they've been watched by a rival. Think about what that requires. You have to understand that another animal has information about where your food is. You have to predict their future behavior based on that. And you have to take action now to protect against a future threat. That's not instinct. That's theory of mind. That's imagining what's happening inside another individual's head. Jays also plan for the future in terms of food variety — studies have shown they cache foods they'll want later, accounting for what they think they'll desire in the future — not just what they want right now. Future-oriented, flexible, self-aware. Not bad for an animal the size of your fist. Wren: And now — thread three — my favorite kind of story. A Corvid-and-People story. Because this is where it gets personal. This is where you realize these birds aren't just smart in an abstract, laboratory sense — they are paying attention to us. Specifically. Individually. The CBC reported on research out of the University of Washington — work led by John Marzluff and his colleagues — showing that crows share information about dangerous humans with other crows. Here's how the study worked. Researchers wore distinctive masks — a caveman mask, in one version — and then trapped and banded crows on the university campus. Just handling them, not hurting them, but crows do not like being caught. The researchers then walked around campus wearing those same masks afterward, without trapping anything, just walking. And the crows — not just the ones who'd been trapped, but others who had never directly interacted with the masked researchers — would mob and scold them. The information had spread. Crows had communicated to other crows: that face is dangerous. Watch out for that face. And this effect persisted. Years later, walking around that same campus in those same masks, researchers were still being scolded. New crows, young crows who hadn't been alive when the original trapping happened, were participating in the mobbing. The knowledge had been passed down. That is cultural transmission. That is a form of teaching. Now flip it around — because crows don't just track enemies. They track friends too. There are well-documented stories of crows — particularly urban crows — bringing gifts to people who feed them. Shiny objects, buttons, pieces of glass, little trinkets. A woman in Seattle famously documented years of gift-giving from a local crow family after she began leaving them food. These aren't random acts. Crows recognize individual human faces. They remember kindness. They remember cruelty. And they respond accordingly, sometimes over years, sometimes passing that information to their offspring. You are not anonymous to a crow. If you've been kind to them, they may know. If you've wronged them — well. They have long memories and a very efficient communication network. I always say: be nice to crows. It's not superstition. It's just good sense. Wren: And that's what I want to leave you with today. Intelligence isn't a single thing, and it doesn't live in a single kind of brain. It shows up wherever it's useful — in the rainforests of Hawaiʻi, where a tiny endangered crow picks up a stick and solves a problem; in the densely packed pallium of a rook navigating a complex social world; in the memory of a Seattle crow who remembers the kid who gave it a french fry three winters ago. The natural world keeps surprising us, and I think that's worth celebrating. This has been Bird Brains, brought to you by Ada, Ago Consulting, and Zen Semiconductor. If today's stories made you look up from your phone and scan the trees for crows — good, that's exactly what I was hoping for. Subscribe wherever you get your podcasts, share the show with someone who needs a little wonder in their week, and check the link in show notes for sources, research, and more. Stay curious, stay kind to corvids, and I'll see you next time.