Every autumn in northern Japan, carrion crows in the city of Sendai drop walnuts onto pedestrian crossings, wait for cars to crush the shells, then collect the meat during the red light — a technique that spread through the local crow population over roughly two decades and now shows up nowhere else in the country
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In Sendai, carrion crows have been documented dropping walnuts into traffic and retrieving the cracked meat when the light turns red. A close reading of what the record actually shows, and what it does not.
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