It seems we got another first for Yellowstone.  This is our second season but we have never visited Hayden Valley during sunset.  It was a magical experience.  We got there right as the sun was going behind the mountains.  The yellows, reds and purple highlighting the sky were magnificent.  The bison rut has started.  We had a good time watching a few males chase their chosen female.

We finished the night at the North Rim of the Grand Canyon.  The best thing about getting out this late in the evening is that there was very few people on the rim.  By time we finished the rim it was completely dark.  We traversed our way slowly through Hayden Valley back to the campground due to bison eyes do not reflect.  The coat of a bison does not reflect either.  You will be right on the bison before you can see it.  Luckily, the herd was in the same space as when we first entered the valley.  We opened the car windows to hear the male bison continue their calls and grunts trying to excite a female.  The moon started to rise by time we entered the middle of the valley.  We got a great picture of the full moon.

This part of the park looks so different in the dark.  We have decided that on our next day off we would do the Norris Geyser Basin at sunset.