american pika in yellowstone national park on rocky mountains.

animal mammal wildlife squirrel rodent whiskers chipmunk nature pet gerbil mouse rabbit grass monkey branch american pika yellowstone national park rocky mountains pikas indicator species climate change fauna ochotona princeps fluffy adorable spermophilus habitat conservation grand teton california mount rainier wilderness lagomorph environment wyoming talus colorado elevation furry glacier emissions hare montana united tates cute scree washington western oregon mountains