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Wild crows inhabiting the city use it to their advantage - David Attenborough - BBC wildlife

12 videos recommended on HN
YouTube
Cited on HN 9 times, 2009–2025, never outright recommended score 0
Years with an HN recommendation, 2007–2026

HN uses it as the standard illustration of animal tool use and adaptive intelligence in crow threads.

A short BBC clip narrated by David Attenborough showing crows in Japan using city traffic to crack nuts, dropping them at intersections and retrieving them when the light changes.

“Here's a video (from Japan) about this phenomenon” (HN, 2015)

9 citations · Documentaries

9 Hacker News comments

From the HN archive; up to 20 kept per video, favoring different commenters. Recommendations first.

@a-priori Mar 2009 Cites it
on HN thread Dolphins blowing bubble rings, and playing with them [video]
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Individuals of many species are capable of copying the behaviour of another individuals (usually of the same species) by observation. The other primates are the most well-known mimics ("monkey see, monkey do"), but most mammals and birds do this. We like to think we're special in this respect, but we're really not. Birds, for example, learn features of their songs from other songs they hear. Over time, these features accumulate in a bird's repertoire, and even develop into a dialect for an area. See [link] Another example in birds is the behaviour of crows in Japan, who have learned to crack nuts by leaving them in traffic at intersections, waiting for the cross signal, then retrieving them. See [this video] This is the first example I've heard of a "play" behaviour being learned, but what can I say? The life of a captive dolphin would be boring; a new way to pass the time would be a useful thing to know.
Shows Japanese crows cracking nuts using traffic.
@ymse Dec 2015 Cites it
on HN thread Crows caught on camera making tools in the wild
Here's a video (from Japan) about this phenomenon: [this video] I wonder whether it was discovered independently, or if it has been communicated somehow. Or maybe they've "always" done this, except with horses before cars.
Video of crows using traffic to crack nuts in Japan.
@yareally Jan 2017 Cites it
on HN thread Macaque monkeys have the anatomy for human speech, so why can’t they speak?
> "Monkeys can be trained to do some pretty complex things in comparison to what a bird can do, it seems to me monkeys are smarter than birds." Crows are likely on par with chimps and dolphins for intelligence by creating their own tools in the wild and other intelligent behavior (language, facial recognition, passing on knowledge). Parrots such as African Greys and cockatoos are right up there too with problem solving abilities. I know cockatoos can be trained to "pick locks" and then pass on the knowledge to other cockatoos. [link] [link] [link] [this video] [link] [link] [link] [link]
@yareally Jun 2018 Cites it
on HN thread Japan Fights Crowds of Crows (2008)
Crows in Japan are definitely quite intelligent. They'll use traffic to crack open nuts by dropping them in front of traffic lights. After a car runs over them, they'll wait for the red light and then retrieve the now cracked open nut[1]. [1] [this video]
Crows drop nuts in front of cars at lights.
@chongli Nov 2019 Cites it
on HN thread AI is mostly about curve fitting (2018)
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We know a great deal more about biological general intelligence than we do about AGI. Many animals create their own goals and work to achieve them. We learn what works and what does not, and adapt our strategies to compensate. Humans do this (obviously) but a lot of other intelligent animals can do it as well. One of my favourite examples is the New Caledonian crows who have learned to use traffic to crack nuts [1]. Here, a crow had no pre-defined objective function apart from "eat food to stay alive" and has accomplished something remarkable. It found a food source that it had never had access to before, it developed a complex model of its urban environment, it combined its knowledge of the problem (the hard nut shell) with its knowledge of its environment (cars crush small objects), and it constructed a sophisticated for strategy for using cars to crack open the nuts and fetching the contents when the traffic lights indicated it was safe to do so. This is general intelligence! [1] [this video]
Crows using traffic as example of general intelligence.

Video list and Hacker News comment labels from HackerTube (prompted by @karpathy), released under ODC-By 1.0, built on the open-index/hacker-news archive. Hacker News data is provided by Y Combinator; comments remain the work of their authors. Video titles, channel names and thumbnails belong to their creators and are shown via YouTube. HackerTube Watch is an unofficial edition. Data export of 2026-10-31.

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