when i was in kindy we had a brid fly in the room and knock itself out on one of the windows and kill itself needless to say there was a lot of hysterics in the class room. I was used to it as we used to breed budgies and they'd fly into shit all the time especially ones that we hand reared in the house, we play with em and they would get lose and fly into shit all the time, the classics were the ones that flew down the ventilation gap for the wall oven needless to say after a roast dinner a couple birds have been lost that way.