Crows: Scary, or Scary Smart?

In one sentence: Crows hold grudges by face, gather around their dead, and build their own tools — this episode makes the case that "birdbrained" was always the wrong insult.

Key Findings

• They remember faces — even upside down. Kaeli Swift, a University of Washington researcher who did her PhD on crow behavior, walks through the original face-recognition study: researchers wore masks to trap wild crows (with precautions to keep the birds safe), banded their legs with colored tags, and released them. Afterward, anyone wearing that same mask — regardless of who was under it — got mobbed: "when they saw that face, they would alarm-call. They would dive-bomb that person." Researchers even tested an inverted version of the mask. The crows paused — "for just a brief moment the crows seemed a little confused" — tilted their heads, and started alarm-calling anyway. As Swift puts it: "You're not getting anything past me. I remember that face."
• The warning spreads without anyone being caught. It wasn't only the banded, previously-trapped birds that mobbed the mask-wearer. Unbanded crows joined in too, "learning from their peers that this particular person is dangerous" — and that knowledge passed not just sideways among peers in the same generation, but down to juveniles learning from their parents.
• Nobody knows exactly how long the grudge lasts — and Swift says so. Asked how long a crow would remember someone who wronged it, Swift answers "years and years," then adds the honest caveat: "There hasn't been a published update, so I can't give you...a scientifically specific number. But I think your assumption should be that that bird is going to remember you for a very, very long time."
• "Funerals" are really two testable hypotheses. When a crow finds a dead crow, it alarm-calls; other crows converge, gather in the treetops or circle overhead calling, and disperse after about 15–20 minutes. Swift's research asked what the birds are actually learning from this: whether they mark the location itself as dangerous, and whether they learn to treat a person seen holding a dead crow as a new predator.
• Both hypotheses held up. In the location test, researchers fed crows at a site for several days to establish a baseline, staged the "funeral moment" (a masked person holding a dead crow), then kept feeding and watched. Crows almost never abandoned the site outright — "very rarely did they avoid the place altogether" — but took noticeably longer to come down to the food than before, a delay not seen in controls: "because there was a dead crow here earlier, I should probably be extra careful before I come down and get my snack." In the face test, crows that later encountered the same masked person — now empty-handed, doing nothing threatening — immediately alarm-called and dive-bombed, "just like in the original facial recognition study."
• New Caledonian crows don't just use tools — they manufacture them. Swift describes crows as "basically flying primates when it comes to their intelligence," beating chimpanzees and orangutans on some cognitive tasks. New Caledonian crows turn twigs into small hooks to fish insects out of wood — "modifying a material for a specific purpose," not just picking up something handy. As far as Swift knows, they're "the only other animal besides early humans that habitually make hooks in the wild" (some captive primates have been observed doing it, but not as a habitual wild behavior).

Scientific Background

"Birdbrained" is the insult this episode sets out to overturn — for most of recent history, humans assumed birds weren't especially smart, and it's only in the last couple of decades that corvid research has undone that assumption. The three findings Swift walks through actually test three distinct cognitive abilities: individual face memory (recognizing a face, even flipped upside down), social learning (danger information spreading without direct experience, passed peer-to-peer and parent-to-offspring), and tool manufacture (reshaping raw material into a purpose-built object, not just using what's lying around). No single one of these is exotic on its own — together, they're what makes the "flying primate" comparison hold up.

The funeral research is also a study in careful experimental design: rather than stopping at the observation that crows respond to their dead, Swift's team split it into two separately testable questions — place association and face association — to figure out what the birds are actually learning. Both Swift and the host use the word "funeral" throughout, but neither the episode nor this summary claims the birds are grieving; the behavior reads as a risk-assessment mechanism, and the source material stops short of any claim about crow emotion.

People

Kaeli Swift — University of Washington researcher who did her PhD on crow behavior and led the "crow funeral" experiments discussed in this episode. She narrates her own study design and findings throughout.

Maddie Sofia — Short Wave host. Opens by admitting crows unsettle her "a little," though "not in the Alfred Hitchcock they're-coming-to-peck-your-eyes-out way," and interviews Swift with a mix of admiration and unease.

Odd Details & Trivia

• The episode opens by noting the English collective noun for a group of crows is "a murder," and plays a clip of Suzanne Pleshette's line from Hitchcock's The Birds for atmosphere.
• On the inverted-mask test: the crows' brief confusion resolved into a head-tilt and then alarm-calling anyway — Swift's summary: "You're not getting anything past me. I remember that face."
• Swift's example of crow caution name-checks a specific snack: even with "those Cheetos" sitting right there, a crow that remembers a death at that spot will hold back before diving in.
• The "flying primates" line isn't just color — Swift follows it immediately with the claim that crows outperform chimpanzees and orangutans on some cognitive tasks.
• The episode signs off with a plug for "a special Halloween episode about some of the zombies of the animal kingdom" airing "tomorrow" — odd, since this episode published September 13, over a month before Halloween. That mismatch is preserved here exactly as it appears in the source (time-capsule rule), not smoothed over.
• The episode closes with the standard 2019-era Short Wave sign-off asking Apple Podcasts listeners for a review.

Cross-Domain Connections

This episode pairs naturally with the already-ingested 马的心智 — both fall under animal cognition, and the contrast is genuinely instructive rather than forced. Horses show almost no categorical perception and re-evaluate the same object nearly from scratch each time they encounter it; crows do close to the opposite, forming a face memory (even inverted) that seems to lock in almost instantly and hold for years. Two very different strategies for handling a repeated stimulus, sitting side by side. A third episode on dogs' emotional attachment to humans, 你的狗真的爱你吗 (source mirrored at sources/shortwave/2019-10-21_does-your-dog-really-love-you_en.md but not yet extracted into the wiki), would complete an "animal cognition trilogy" alongside horses and crows. That link currently points to a page that doesn't exist yet — flagged here as a placeholder, not filled in with invented content.

Pages to Build

• tool-manufacture — the distinction between using a tool and manufacturing one is a key dividing line in animal cognition research; Swift draws it explicitly to separate New Caledonian crows, chimpanzees, and early humans from everything else. It's likely to recur in future episodes on primate or bird tool behavior, so it's worth a standalone page. Kaeli Swift herself, along with the specific face-recognition and funeral experiments, are treated as one-off content for this episode and aren't queued for their own pages.

Source · shortwave