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The American pika, a small mountain¿dwelling mammal in the West, is one of many animals that can't tolerate the heat brought on by climate change, scientists say.

ScienceConservationWeatherEnvironmental IssuesEcosystems
The American pika, a small mountain¿dwelling mammal in the West, is one of many animals that can't tolerate the heat brought on by climate change, scientists say. AP Photo/US Geological Survey
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