I was walking up from Drumheller Fountain just now, and I heard a
commotion. I looked up at the top of Gerbalding Hall and saw a crow dive
bombing a seagull perched on an upward protrusion. The seagull was using
profane language. After a bit the crow perched on another protrusion
close by, and they sat together for a minute.

The crow picked up the bombing, and another crow joined in. After a
couple dive bombs the newcomer swooped up from below, displacing the gull,
and right at that moment the first gull scored a touch, a light one right
on the back.

Sweet move!