geothermal landscape in yellowstone national park

america american animal animals aspen autumn bacteria badlands bison blue buffalo color colors coyote extremophile faithful fall family foliage geothermal geyser geysers grassland herbivore hot landscape leaves mammal microorganism montana mountain mountains national nature old park plains prairie road rocky skies springs supervolcano thermophile thermophilic trip usa vacation volcano west wild wilderness wildlife wolves wyoming yellowstone