If you rent a cabin in Custer SP you may be able to see entire herd of bison come and graze right in front of your cabin! They are abundant in this park. We also saw lots of mule deer and some antelope, wild burros—but the thing that filled me with awe, again and again, was seeing the bison in a natural environment like they must have been hundreds of years ago. Very pleasant weather in August 2007.