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Summit living isn’t a problem for this tiny mouse

Researchers found the mice rely on metabolic and genetic changes, not hemoglobin shifts, to stay warm and survive thin air.

Summary by Science News
A boost to heat production and drawing in more oxygen may help Andean leaf-eared mice thrive at altitude.

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The yellow-eared mouse can live at an altitude of more than 6700 metres in the Andes, which upsets our understanding of physiological limits.

·Montreal, Canada
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According to the researchers, there is a continuous flow of genes between different populations, indicating that natural selection acts very intensely on a small group of genes related to survival in extreme conditions.

Six years after discovering it on some of the highest peaks in the world, scientists have just published in the magazine "Science" their discoveries on the "mouse with yellow ears". Its ability to live at very high altitude could even advance human medicine.

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Science News broke the news in United States on Thursday, July 9, 2026.
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