RPS member Jeff Pollitzer gave a tutorial on Sports & Nature Photography. While not an obvious combination, they both use similar camera equipment especially if you consider active nature such as bird photography. Light and speed play an important role as the subjects are often moving and are taken from a distance . Understand the crop sensor on your camera to enable getting a bigger image from farther away. Know the sport and study the action so you can position yourself for the best shots. Pre-focus is a useful technique whether it's on the backyard bird feeder or the goal line of the game. Be patient and take lots (and lots and lots) of photos to get the one perfect shot.