Crows remember the faces of people who've wronged them. They have a long memory and they share their memories with other crows. Researchers disguised as Dick Cheney when banding crows were afterwards mobbed by the same crows when they returned. Crows that weren't witness to the original harassment also came to recognize the danger posed by Dick Cheney. Wherever Cheney went on campus he was mobbed and met with shrill derision.