A friend of mine had a parrot that greeted me and some friends as we arrived. Shortly after arriving on of my friends started making faces towards it and immediately it tried to attack him, but left him alone for the rest of the night.
As we left the parrot said bye to everyone but him.
A week or two later we came back. My friend had forgotten. The parrot had not and immediately attacked as he came close :-)
And seaguls also. I'm convinced that the seagul that attacked me with an um air-dropped er weapon was the same one that I shooed away from my window on the same day one springtime.