Crows recognize individual human faces and can hold a grudge if you treat them badly.

Field biologists have observed that wild crows seem to recognize them, and this ability has been shown to last up to three years! The birds pay close attention to human behavior and which individuals could potentially pose a threat to them. Scientists have gone to extremes such as wearing masks whenever they go to capture and band the crows, but the crows soon were able to remember which masks had invaded their territory, whether it was a caveman or former vice president Dick Cheney! (source)


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