Wild crows can recognize individual human faces and hold a grudge for years against people who have treated them badly. Scientists at the University of Washington donned a rubber caveman mask and then captured and ringed wild crows. If the crows were later approached by someone wearing the same mask, they loudly scolded the intruder. The crows' antipathy to the caveman mask has lasted more than three years, even though they have had no further bad experiences with people wearing it.
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