Yaks help pikas survive brutal Tibetan winters


Pikas on the Qinghai-Tibetan Plateau don't migrate or hibernate in winter, but food is scarce in the high-altitude environment, where temperatures often fall below 22 degrees. The little mammals survive by lowering their body temperatures and reducing physical activity, and some eat domestic yak feces to survive, according to research published in Proceedings of the National Academy of Sciences.

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