I had a breeding pair of peregrine falcons living over my porch and there are also many crows that live nearby. One day the falcons had caught and partially eaten a crow who managed to escape the nest and make it to the ground. Every single crow within at least a mile radius (probably close to a hundred) showed up and some of them tried to fight with the falcons. They were loud and quite agitated for a couple of hours. For the rest of the time while the falcons were nesting I stopped feeding the crows peanuts because they steered clear of the area, as soon as the falcons left they showed up again.
Crows are amazing creatures.