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Wood frogs don't pee all winter, and it helps them survive the cold
Untitled, PDF, Frog
The frozen hard truth about frogs during the winter
bioPGH Blog: A Frog Winter's Nap, Phipps Conservatory and Botanical Gardens
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Frog Encyclopedia MDPI
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Adaptations of Animals - SAS
How do frogs survive winter? - Reptiles & Amphibians - Quora
Where do frogs go in winter? Amphibian and Reptile Conservation
Overwintering Strategies of Frogs and Toads — Minnesota Women's Woodland Network
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Scientific American's Ask the Experts: Answers to the Most Puzzling and Mind-Blowing Science Questions by Editors of Scientific American, Paperback