Science News9%
Summit living isn’t a problem for this tiny mouse 14%
By Erin Garcia de Jesús6%
7/9/2026, 6:06:19 PM
BS Summary: This article contains 14 faulty reasoning types, including Hasty Generalization, Confirmation Bias, and Post Hoc (False Cause), with Overconfidence Bias as the most egregious example at 31.3% saturation with 86 hits. Analysis detected 475 faulty-reasoning hits from 275 analyzed words, generating a BS Score of 30.2% and a BS Rank of 14% (18,349 of 21,152 articles). This article is better (less manipulative) than 86.70% of the article peer group.
It’s not easy living the high life.
Take it from the Andean leaf-The mice.
Evolutionary biologist Jay Storz of the University of Nebraska–Lincoln and colleagues have summited many Andean peaks in search of small mammals, including during a 2020 excursion that uncovered the Andean leaf-eared mouse as a world record holder.
Excursions are several weeks long so that the team can acclimate to the altitude and conduct wildlife surveys as they climb, Storz says.
But unlike mountaineering humans, “mice can’t wear Gore-Tex jackets.”
Storz and colleagues compared how Andean leaf-eared mice captured at different elevations fared in small chambers that simulated the frigid, low-oxygen mountaintop environment.
High-altitude mice consumed oxygen at a higher rate than low-altitude animals, a hint that mice living at high elevation would be more active in the cold.
Metabolic and genetic analyses suggest that shivering muscles help high-altitude mice produce extra heat.
What’s more, the animals’ blood cells might store extra carbon dioxide, which would lower the risk of hyperventilation from breathing fast at high altitude where the air is thin.
“They’re basically engaging all of their metabolic machinery toward the goal of maintaining a constant body temperature,” Storz says.
The genetic analysis also offered a clue that both lowland and highland mice can detoxify compounds from a poisonous diet.
Desert animals, limited by what’s available, often feed on toxic plants.
It’s unclear how adaptations to both a harsh environment and a toxic diet might be related, but it could be more complicated to deal with both at the same time.
For these mice, Storz says, “things are really tough all over.”
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