I have shot endless hummingbird photos in the backyard at home.  There was one shot that eluded me for a while.  At a certain time of day, if a hummingbird is at the feeder, its shadow will fall on the post on the corner of our deck.  I have seen it a few times when I didn’t have a camera handy and have had a camera when none came or the light moved around too quickly.  However, I did finally get the combination I was after.  I like the hint of the hummingbird without the actual bird in shot that it delivers.