Ah! I love the intelligence of birds! Crows and many of the other birds in the Corvus family do this too! There is a story of a man that would harass a crow out side of the building he worked at whenever he was leaving, and in turn the crow would react negatively to him. Eventually dive-bombing him since he was perceived as a threat. That crow apparently told his family, and they recognize him as the culprit to continue their attacks at. He had left his home town for a time and came back to find out that they had even told their offspring of it and would attack upon realizing he was that human. I want to know how they told of his description in their lil' birdy speak. Anywho, here's a link to a study some researches did with some crows to test this theory out.
http://www.livescience.com/14819-crows-learn-dangerous-faces.html