Mondo Knows Facts
Some frogs sit out the Arctic winter as ice
The North American tree frog tolerates freezing for weeks Its liver produces large amounts of glucose that acts as antifreeze in the blood. The frog survives temperatures well below zero, even inside the Arctic Circle. Ice formation starts in extremities and pauses vital organs. It sits in Mondo's animals collection, one of 200 facts that each trace back to the reference below.
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Facts that can change over time are reviewed and updated. If something here looks wrong, Mondo would rather know than be confidently incorrect.
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A wood frog survives with two thirds of its body frozenIt stops breathing and its heart halts while ice forms around the cellsA diving seal slows its heart to a few beats a minuteThe dive reflex shuts blood away from limbs and directs it to the brain and heartHumans hear roughly 20 hertz to 20 kilohertzThe top end declines with age, and children hear higher than adultsCold narrows the vessels in fingers and toesReduced skin blood flow keeps warm blood in the core at the cost of cold extremitiesVostok Station recorded the lowest natural surface temperatureThermometers plunged to minus 89.2 degrees Celsius in AntarcticaOymyakon is the coldest permanently inhabited settlement on EarthWinter temperatures in this Siberian village drop below minus 60 degrees
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Tags: amphibians, cold, physiology
Some frogs sit out the Arctic winter as ice: the short answers
- Where does this come from, and can I check it?
- The North American tree frog tolerates freezing for weeks. The figure is taken from Britannica, which is linked in full on this page. Every fact on Mondo Knows names its source rather than repeating an unsourced claim.
- Is this really a animals fact?
- Yes. It sits on the Animals shelf, one of 2,600 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.
- What else can I read about it?
- The links under the fact point to a quiz, game, puzzle or calculator on the same subject, and the shelf below shows related facts. The wording here is original, and quoted phrases are marked as quotations.