In Your Face!
Starlings, Blue Jays and Red-bellied Woodpecker. Interesting behavior here... the jays and starlings fussed with each other quite a bit. The woodpecker (female) couldn't be bothered except to "show her teeth" (beak) when pushed. She landed in the midst and all moved aside for her. Any attempt to drive her away simply met with the show of a sharp beak. A very effective technique.