In an effort to see as much of the park as possible, we headed north towards Mammoth Hot Springs. The Dragon's Mouth Spring scared the snot out of our kids when they were little because of the roaring sounds coming out of the cave.
We pulled over here for a pit stop and it's a good place to see where a fire burned the forest and then how it comes back. Apparently lodgepole pine trees can remain standing for up to 25 years after they have been burned. The park doesn't cut the timber down because it provides habitat and fertilizer for the forest and its animals.