My tiel has developed a few funny habits since I moved him into a new room. I have it sectioned off with baby gates so the bunnies only have access to half of it.
He gets behind the baby gates and lures the bunnies over to him, then tries to bite their noses through the gate, cause he knows the bars will protect him from the rabbits. Not that they would ever try to hurt him anyway, but when he bites them they do get up and hop away and it scares him, so he has protection now!
He has stolen the bunnies cardboard tunnel. If a rabbit dares try to enter it, I get to hear a very angry tiel chasing a rabbit biting at their feet. I ended up just putting it back behind the gate on his side since the rabbits didn't get to use it anyway. He now crawls in there and makes his cute little happy chirps sometimes, but only when the rabbits are in the room, I swear he's bragging to them.
When the bunnies are bad I put them back into their room. I did that yesterday and they hadn't finished their salad, so I come back in and the bird is on the floor eating the uneaten veggies (safe from bunny germs, I spread greens out and watch them eat since the bird likes to eat with them so he doesn't get their germs from it) making his laughing noise. I guess he was thinking "haha dumb mammals, now this salad is all mine!"