This tufted puffin on the Oregon Coast was entertaining itself by splashing in the water, and it was quite comical to see. Due to the frantic movements, I used a fast shutter to make sure every detail of the bird and the water was sharp. In addition, since birds have depth, I selected a lens aperture with enough depth of field to include everything that needed to be sharp. I had to raise the ISO, of course, to get the fast shutter and the depth of field in muted, diffused light, but today that's not as problematic as it was in the past. Newer cameras handle noise quite well, and we have Neat Image software (a plug-in for Photoshop) to mitigate noise in post-processing. My settings were 1/1600, f/11, and 2000 ISO. I used a 100-400mm lens for the shot.