Where does this come from, and can I check it?

Up to two thirds of a wood frog body water freezes during winter. The figure is taken from National Park Service, 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 1,090 sourced facts grouped into space, animals, the human body, history, science and more. Category pages collect every fact in the same field.

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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.

Mondo Knows Facts

Wood frogs freeze solid during winter and revive in spring

Up to two thirds of a wood frog body water freezes during winter.

Wood frogs accumulate high concentrations of glucose and urea in their cells before freezing. These natural antifreeze compounds protect cell structures while breathing and heartbeat temporarily cease entirely until warm spring temperatures thaw the frog back to life.

February Winter Freeze (33377711556) — James Mann from Moncton, New Brunswick, Canada · CC BY 2.0 · licence · source

Where this comes from

National Park Service

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Tags: frog, winter, adaptation

Wood frogs freeze solid during winter and revive in spring: the short answers

Where does this come from, and can I check it?: Up to two thirds of a wood frog body water freezes during winter. The figure is taken from National Park Service, 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 1,090 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.