Tiny mice found mummified at the summits of Andean volcanoes appear to be living in the harsh environment, which resembles Mars more than it does Earth
Tiny mice found mummified on the peaks of Andean volcanoes had made a home in the Mars-like environment, new evidence suggests—as impossible as the feat would seem.
That’s why he and one of his colleagues were shocked when, near the top of the Andean volcano Llullaillaco in 2020, they stumbled on a living leaf-eared mouse at 6,739 meters above sea level. At that altitude, vegetation is scarce, winds are fierce, and the air contains half as much oxygen as it does at sea level. The mouse immediately claimed the title of the world’s highest-dwelling mammal known to science.
Then the scientists sequenced the genomes of the high-altitude mice and compared them to the genomes of leaf-eared mice found at lower elevations. That analysis suggested that these two groups of mice were closely related and still members of the same species. The researchers also determined that the summit mice were split evenly between males and females and that two pairs of mice found on one peak were either siblings or a parent and a pup.
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