I had to hike a good mile and a half with my camera until I found a field near a large grove of oak trees where the bison graze, poop, roll in the mud and lay in the sun — occasionally one would try to make love to another or put on the Buffalo Nickel pose for me, although they are technically bison, having a hump at the shoulder and beard below the chin. They are much like cows in that they can be friendly but cautious. One in particular approached me …