This image of a Least Tern in flight on a very dark overcast day was possible only because I increased my ISO beyond my usual comfort level. I don’t normally, even attempt to photograph birds in flight on days that are this dark because I don’t like the noise that results from the high ISO settings that are necessary to result in an adequate shutter speed for birds in flight. This image was shot at ISO 500, 1/1600th shutter speed.