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Wood Frog — printable fact sheet
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Wood Frog
Rana sylvatica
The wood frog survives winter by freezing solid. As much as two-thirds of the water in its body turns to ice, its heart stops beating, it stops breathing, and measurable brain activity ceases — by any ordinary standard it is dead, and it stays that way for weeks or months. The t…
Did you know?
- Up to 70% of a Wood Frog's body water can turn to ice during winter, and its heart actually stops beating until it thaws in spring.
- It freezes solid every winter — heart stopped, no breathing, no brain activity, up to two-thirds of its body water turned to ice. Its liver floods the body with glucose, which packs each cell so densely that the water inside cannot crystallise. Ice forms only outside the cells, where it does no fatal harm. In spring it thaws and the heart restarts by itself, and hours later it is hopping.
What I learned
Draw the wood frog
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