American Bison, WyomingMay can be a great time to visit Yellowstone National Park because you never know what kind of weather you’re going to get and it can change drastically from one moment to the next. Back in 2011, I visited later in the month and at times it felt like summer, at times winter, and on this morning, somewhere in-between. Frost and light snow was covering the landscape as the day began but by mid-day the sun was bright and the hills were green with new growth. And, of course, the great thing about Yellowstone is, when the conditions are right, there are always a few bison around willing and able to walk into the middle of the scene. Nikon D700 with Nikkor 70-200mm lens (at 70mm) ISO 800, f/5.6 at 1/320th of a second.