I had the pleasure of living in Yellowstone National Park for 2 years and there are about 6 courses in the park although only one is identified on DGCR.
My home course was at the Old Faithful location and my friends and I got to see some of the most amazing things on the course. Most common were herds of Elk or Bison but we also got to see Golden and Bald eagles eating an Elk carcass, a grizzly feeding on a bison (right on hole 10's tee), coyotes, and black bears.
It is a pretty awesome course but dangerous, geyers and hot springs right near some of the pins. I have third degree burns on my foot where I broke through thin ground to scadling hot water while putting out on hole 5.
That is why nobody has ever listed it on here because you need to play the course with someone experienced to show you what is safe and what is dangerous.