I photographed this Common Murre (bridled form) against the shadows under the cliffs during my recent Deluxe Puffins Galore and so much more workshop in Québec, Canada. It was a dark and cloudy morning with a distinct absence of light (to say the least). I knew I wanted to freeze the wingtips, so I chose 1/5,000 of a second shutter speed, leading me to use an ISO of 20,000 while wide open at f/6.3.