I watched a herd of bison in some early morning light from my car as I sat in a pullout. This pregnant cow bison began walking to the road. Bison herds are usually led by a dominant cow and this may have been her as the herd slowly followed. They grazed the fresh, green grass as they found it and eventually crossed the road to move into a thermal area where the ground was warmer and the grass greener. I liked this scene with the cow facing me while the rest of the herd was out of focus behind her.