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Keyword: shivering

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  • To survive frigid nights, hummingbirds cool themselves to record-low temperatures

    09/09/2020 10:05:12 AM PDT · by DUMBGRUNT · 17 replies
    Science ^ | 8 Sept 2020 | Lucy Hicks
    High in the Andes, thousands of meters above sea level, speedy hummingbirds defy near-freezing temperatures. These tiny flyers endure the cold with a counterintuitive trick: They lower their body temperature—sometimes as much as 33°C—for hours at a time, new research suggests. With a metabolic rate roughly 77 times that of an average human, they need to feed nearly continuously.But when it gets too cold or dark to forage, maintaining a normal body temperature is energetically draining. Instead, the small animals can cool their internal temperature by 10°C to 30°C. This slows their metabolism by as much as 95% and protects...
  • Climbers may struggle with hypothermia ( Mount Hood )

    12/19/2006 3:17:39 PM PST · by george76 · 23 replies · 953+ views
    Associated Press ^ | December 19, 2006 | TIM FOUGHT and SARAH SKIDMORE
    It starts with mumbling and stumbling. Then come violent shivers and then, paradoxically, a false sense of warmth that makes some people strip their clothes off. Eventually, they may curl into a fetal position as their muscles go rigid, their skin goes waxy, and the heart slows down, then stops. Whether two climbers missing on Mount Hood for more than a week are still alive is not clear. But if they are somehow still hanging on in the brutal cold and howling winds, perhaps hunkered down in a snow cave, they may be going through what veteran climbers say is...