Golden mantled ground squirrel: there were many of these active and inquisitive squirrels in and around the Green River campground.

This national monument is the only place where I have seen white tailed prairie dogs. They live in much smaller groups than their black tailed relatives, so, being used to the large prairie dog towns of the latter, when I first saw this one poking its head out from under a rock I assumed it was a ground squirrel.