The title of this thread is a bit misleading. This was NOT a landing gear failure. I was looking out my backdoor at a Starling, when it SUDDENLY fell forward on its breast with its wings outspread and proceeded to lie like that for two or three minutes. Then it rolled from side to side, stretching the wing and leg on each side in turn. Looking around I noticed the House Sparrows and even an American Robin in my back yard were doing almost the exact same thing. My guess is that they were either sunning themselves, cooling themselves, and/or trying to get rid of mites. It was the first time I've ever noticed this behavior.
OOPS!