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Project Noah Nature School
Rana sylvatica
"Similar to other northern frogs that hibernate close to the surface in soil and/or leaf litter, wood frogs can tolerate the freezing of their blood and other tissues. Urea is accumulated in tissues in preparation for overwintering, and liver glycogen is converted in large quantities to glucose in response to internal ice formation."
Spotted on Oct 6, 2011
Submitted on Nov 10, 2011
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