South of the Grand Canyon of the Yellowstone, this valley is home to an abundance of wildlife. Nature photographers will want to linger to get a shot of the resident moose, elk, bears and bison. The bison act as if they own the place—herds often stray across the road, oblivious to cars. Hayden Valley is also an excellent place to spot waterfowl. The Dragon's Mouth Mud Volcano is worth a stop to see gurgling mud pots, geothermal features where the rock has been broken down by water rich in sulfuric acid. On the Grand Loop between Canyon Village and Fishing Bridge, Yellowstone National Park.
