My best wildlife photo of 2017 was of this inquisitive little pika I encountered high in the mountains of the Sierra Nevada. American pikas are facing increasing pressure, as global warming is reducing their habitat range. Pikas thrive in mountainous areas and cannot tolerate hot temperatures. As temperatures warm, they are forced higher in elevation. This particular pika was found between 10,000 and 11,000 feet in elevation. In the future, they may only be found at even higher elevations--12,000 feet or more--or may even be forced into endangered status due to shrinking habitat.