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Went down the rabbit hole on this. A wildlife biologist at the University of Washington put on a rubber caveman mask, trapped seven crows on campus, and let them go. For nearly three years afterward, every time he wore that mask, crows screamed at him from the trees. Even crows that had only watched the original trapping joined in. Crows that arrived years later learned to scold the mask from the others.The brain doing all this is the size of a walnut. In 2016, a research team at Vanderbilt and