I've seen a flock of parakeets attacking a comorant in flight above Brockwell Park and Sunray Gardens. I think they are just aggressive pests. >>>I saw about a dozen parakeets buzzing/strafing a heron on one side, with a crow doing likewise on the other, about 150 feet up near to Village Square??I had seen a crow doing the same to a heron seated high up in a tree in Peckham Rye, near the lake. Don't they get on or could it have been staking out nests, etc?