Wild Bear Adventures is the tour to take!  It's personalized to your interests, surpassing any organized tour.  Because of  Eric's knowledge and background, he was able to answer all our questions. It was fascinating to hear about the reintroduction of the wolves and hear the stories of the first wolves that came back to Yellowstone.  We hiked up to an old wolves den, saw a baby pronghorn being born, and ospreys' nest and fishing.  We saw things we would've never seen on our own. It was a phenomenal day, exceeding our wildest imagination, truly fantastic!  If we ever come back up there, I would book another day or two with Wild Bear Adventures.  It's the only way to experience Yellowstone.