The bison breeding season usually starts up by the end of July and runs through August. Typically most of the activity takes place in either the Lamar or Hayden Valleys but last week I came across a herd of bison in the Fountain Flats area. Of course the big bulls were following the cow bison around, as seen here. These large bulls should always be given plenty of room, much more than the required 25 yards, but even more so at this time of year when they’re fueled up on hormones. I photographed this one from my car, using a beanbag to support my telephoto lens.