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This is a scientific American 62nd science. I'm Julia Rosen.

In 2013, two mountaineers were nearing the top of Volcan Jujuzijko, a 22,000 foot tall volcano on the

border of Chile and Argentina.

When they saw something unexpected, just 2,000 feet below the summit, the climbers spotted a mouse scurrying across the snow.

And it's really a remarkable sighting because no one expected wild mammals to be living at an elevation of over 20,000 feet.

At that elevation, it's the scarcity of oxygen,

oxygen that makes it really a challenging place

to survive and function.

But then also just the extreme cold. It's an extremely inhospitable environment.

Jay Storts, an evolutionary biologist at the University of Nebraska.

The climbers reached out to Storts because he studies how animals adapt to high altitudes,

and he was so intrigued that he decided to make his own trip to survey the area.

Storts and his colleagues spent a month at Jujico earlier this year where they confirmed what the climbers

saw. They found mice everywhere, including on the summit, officially setting a new record for the

...