Mating calls and hot springs...Yellowstone, the sequel

Overnight, we were roused a few times by the mating calls of nearby Elk.  Apparently, its the start of mating season, and there was love in the air.  We were also made aware that a Grizzly and her cubs had recently wandered through our campsite.  Alas, we did not see them, I was dissapointed, Sarah was relieved, probably the more sane reaction.  We drove North past the West Thumb of Yellowstone Lake, which is enormous, to the upper and lower Yellowstone river falls.  They were set deep in a valley and had some spectacular landscape surrounding them.  There was a path, that led to a series of metal staircases leading 3/4 of the way down into the valley that I couldnt resist.  Sarah was less then thrilled(a series of switchbacks, her favorite, leading to 300+ stairs), but it did offer an up close and personal view of the lower falls.  Just past the falls, there was artists point, which was inspiring, an array of colors coming out of the valley walls.  We then passed through the Mammoth area, with terraces of hot springs, pools, even a hot spring waterfall.  On our way through the town of Mammoth, we were suprised to see a crowd of people gathering around a town park area.  They were all there to see a male and a half dozen or so females, right in the middle of town.  But it was time to continue on our journey, so we departed for Great Falls MT and tomorrow, on to Glacier National Park.