Humming Birds on the move

Humming birds are beginning their migration through Central Texas. I love this time of the year. I have a feeder right outside my office window and am treated to displays as the birds stop for a snack. In years past, the birds would just hover as they drink, but this year, I've seen several that actually grab hold of the feeder and hold on as they dip their bills in and out ... their wings never stop, but they are holding on. Interesting. Since my window faces the west, I have a very heavy screen on it so the birds can't see me as I watch them. Unfortunately, it also means that I can't get any good pictures of them. Oh, well ... ok, back to work now!