Spreading Crow Intelligence - California Academy of Sciences

Wren: Hey there, and welcome to Bird Brains — the show where being called a bird brain is absolutely, one hundred percent a compliment. I'm Wren, ornithologist, corvid obsessive, and your guide through some of the most mind-bending animal intelligence stories on the planet. Huge thanks to our sponsors today — Ada, who helps businesses actually integrate A I into their workflows in ways that stick; Ago Consulting — that's "Ahh-Go" — silicon development consultants covering everything from A I to full SoC design; and Zen Semiconductor, an umbrella company with a whole portfolio across the silicon industry. We are in excellent company today. And speaking of excellent company — on today's episode, we've got crows using tools in ways that will make you question your own problem-solving skills, we're diving into the science of what's actually happening inside those glossy little heads, and we have a story about crow grudges — and how they don't just hold them, they share them. Let's go. Wren: Alright, first up — Corvid Cleverness. And I want to start with a question. Have you ever been stuck on a problem, picked up a tool, and used it to get what you need? Of course you have — you're human. That's our whole thing, right? Except, it's not just our thing. Not even close. Crows have been documented using tools in ways that genuinely stopped researchers in their tracks. One of the most famous examples comes from New Caledonian crows — a species that has become something of a rockstar in the cognitive science world. These birds craft hooks out of plant stems. Not find hooks — make them. They'll select a specific type of twig, strip it, bend it, and use it to fish grubs out of holes in wood. That's manufacturing. That's planning ahead for a task that hasn't happened yet. And here's what really gets me — when researchers gave New Caledonian crows a problem that required using one tool to retrieve another tool, which could then retrieve food, a significant number of the birds figured it out. Multi-step tool use. The kind of thing we tend to assume requires a big, wrinkled primate brain. But corvids are pulling it off with a brain roughly the size of a walnut. Now, Science News covered what they called "tool use to crow about," and honestly, that headline does not oversell it. Researchers have also observed crows in the wild dropping hard-shelled nuts onto roads — waiting for cars to crack them open — and then timing their retrieval around traffic lights. They wait for red. They walk out, grab the nut, and fly off before the light changes. That's not instinct. That's traffic awareness. That is an urban crow who has figured out how cities work and bent that knowledge to their advantage. The California Academy of Sciences has been tracking how crow intelligence spreads — literally, how smart behaviors propagate through crow populations the way culture spreads through human communities. A crow learns something clever, and other crows watch, copy, and pass it on. That's social learning. That's culture. And every time I think about a crow standing at a crosswalk, waiting for the light, I think — yeah, bird brain. Absolutely. That's exactly what you are. And I mean that with my whole heart. Wren: Okay, thread two — How Their Minds Work. Because it's one thing to say corvids are smart. It's another to understand why, and what's actually going on under those sleek feathers. Here's where it gets genuinely fascinating. For a long time, the assumption in neuroscience was that intelligence required a neocortex — that layered, folded outer layer of the mammalian brain that we associate with higher thinking. Corvids don't have one. Their brain structure looks fundamentally different from ours. And for decades, that was basically used as evidence that birds couldn't really be that smart. Turns out we were measuring intelligence with the wrong ruler. What corvids have is a region called the pallium, and specifically a dense cluster of neurons in the nidopallium caudolaterale — and yes, I know that's a mouthful, but stay with me — that functions remarkably like our prefrontal cortex. It's involved in planning, decision-making, and flexible problem-solving. Different architecture, same output. And if that isn't a lesson in not judging a book by its cover, I don't know what is. Nature World News put out a piece recently ranking the smartest birds on Earth, and corvids dominate that list in a way that shouldn't surprise anyone listening to this podcast. But one of the things that piece touched on — and that I really want to dig into — is face recognition. Crows recognize individual human faces. This has been tested rigorously. Researchers at the University of Washington conducted experiments where people wearing specific masks trapped crows, and then those same masked individuals walked around campus afterward. The crows scolded them. Specifically. Not all humans — the humans in the mask. And critically, crows who had never been trapped but were nearby when it happened also learned to recognize and scold the mask. They learned from watching. And they remembered. For years. Magpies, meanwhile, are the only non-mammal known to pass the mirror self-recognition test — they see themselves in a mirror and understand that the reflection is them. They will try to remove a mark placed on their body that they can only see in the mirror. Self-awareness, in a bird. Ravens have demonstrated what researchers call prospective cognition — they plan for future events even when the reward isn't going to come until tomorrow. They'll pick up a tool, put it somewhere safe, go to sleep, wake up, and use it. That requires holding a future event in your mind. That requires something very much like imagination. And I think that's what I find most astonishing about corvids. It's not just that they're clever in the moment. It's that they are thinking ahead. They are living, at least partially, in a future that hasn't happened yet. Just like us. Wren: And that brings me beautifully to thread three — Corvids and People. Because the relationship between crows and humans is one of the most layered, complicated, and honestly moving stories in the natural world. Let's talk about grudges first, because Discover Magazine covered this and it is too good not to dig into. We already know crows remember faces. But here's the kicker — they don't just remember. They tell their friends. Researchers found that when a crow had a negative experience with a specific human, it would communicate that threat to its flock mates. Family members. Neighbors. The scolding behavior spread socially. So a crow who never had any interaction with you might already have a bad impression of you — because a crow you annoyed three years ago told their crow family, and their crow family told their crow friends. You have a crow reputation. You have a crow record. And on the flip side — and this is the part that I think is genuinely beautiful — crows also remember kindness. There are documented cases of crows bringing gifts to humans who regularly feed them. A girl in Seattle named Gabi Mann became something of a news sensation because the crows in her neighborhood started leaving her small objects — buttons, pieces of glass, a tiny heart-shaped stone — after she made a habit of leaving them food. Wildlife experts weighed in and confirmed this is a recognized behavior. Crows form bonds with humans who treat them well, and they reciprocate in the only currency they have. And then there's what Harvard Magazine recently highlighted — crows know how to have fun. This is documented. Crows have been filmed repeatedly sliding down snowy rooftops, flying back to the top, and doing it again. No food reward. No survival benefit. Just wheeeee. Ravens play too — they dangle from branches, roll in snow, engage in what researchers describe as object play for its own sake. Joy. These birds experience something that looks, quacks — or rather, caws — like joy. And when you put all of this together — the grudges, the gifts, the games — what you get is a picture of an animal that has an inner life. A social life. A reputation to manage and relationships to maintain. Urban crows have been adapting to human environments for centuries, and in many ways we've grown up alongside each other. We built cities, and they figured out how to live in them — reading our traffic patterns, raiding our compost, watching our faces, and occasionally leaving us a little button as a thank you. I don't know about you, but I find that extraordinary. Wren: So here's what I keep coming back to — intelligence is not a straight line with humans at the top. It's a whole sprawling, branching, endlessly surprising landscape, and corvids are out there staking serious territory on it. Different brains, different paths, same astonishing result: creatures who plan, who remember, who feel, who play, and who — let's be honest — are probably judging us right back. Bird Brains is brought to you by Ada, Ago Consulting, and Zen Semiconductor — three teams who know a thing or two about smart systems, which feels very on-brand for this show. If today's episode made you look twice at the crow on your fence, good. That was the goal. Subscribe wherever you get your podcasts, leave us a review if you loved it, and share this episode with someone who still uses "bird brain" as an insult — they need us. Show notes with links to everything we talked about today are waiting for you. Stay curious, friends. The birds certainly are.