I have mentioned before the difficulty I have had when trying to photograph flickers.  They are so easily spooked.  When one showed up in the back yard recently, I knew there was no way I would be able to go outside and try for a shot.  Through the windows was my only option.  Two layers of glass are not ideal for photographic clarity, but it is better than nothing.  Even then I have to be cautious since even the movement within the house is enough to scare them off.  Some careful positioning and very slow movements meant I was able to get a few reasonable shots.  It wasn’t long before they were off, though.  Whether it was me or just time to go to the next spot, I don’t know.