On the Fly, Literally, Double Meaning

One of my favorite photos because it shows how lucky you can get with a decent digital camera. Here's the set-up; it's late January. We're ending a nine-hour tour of Yellowstone National Park, riding in a snow coach - a cute little 10-seater with tractor treads in back and two skis in front for steering. I'd finally claimed the front passenger seat for myself, thank you very much, with camera in lap, at the ready. We're heading west along the Madison River, bumping along at maybe 15 mph, and I see this flash of white heading east, zooming along at who knows what speed. I lift the camera and shoot, bang (so to speak), right through the windshield, and this shot is the result. Tundra swans are fairly rare but they love Yellowstone. Magnificent birds!