I think I saw one
A tiny bird just shot by my window too fast to really see what it was, and went into a holly bush. It flitted around in there out of sight except for flashes of a tiny head, then all of a sudden he kind of stood on his head and I got a clear view of a tiny bird bottom and under the tail -- it was white.
I think it was a hummer, because of the speed, the size and the white bottom.
Please say I'm right :)