This undated photo released by the U.S. Geological Survey, shows a mountain-dwelling American pika. The American pika, a short-legged, softball-sized fur ball that often huddles in high mountain slopes, isn't built for long-distance travel. So as the West's climate warms, the tiny pika has little choice but to scurry a little farther up slope to beat the heat.(AP Photo/US Geological Survey, File)
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