Winter has arrived in Yellowstone National Park. There are already a few feet of snow at the higher elevations. The snowplows are busy keeping the roads clear. This past week, the temperture has fluctuated between an invigorating -10 degrees and a comparatively balmy 21 degrees. The critters in Yellowstone adapt readily to the cold temperatures. This trio of Bison graze on the grasses peeking through the covering of snow near Soda Butte.