A very unhappy black rat snake gets a taste of its surroundings in this picture.
Believe it or not, my 13-year-old daughter carried this snake home (she found it in the woods nearby). While the grass in the front yard does not make a good background for snake pictures, I was able to blur the grass into a very pleasing green color by getting down to a ground level shooting position, moving in close and aligning with a brightly lit area behind the snake.
This image represents the near maximum magnification of the Canon 200-400 L lens. I say near because the snake was constantly moving and I had to leave insurance distance to accomodate for its motion.