These frogs are capable of surviving in the frozen state and they can further survive well when shifted to normal temperature say the scientists at the University of Alaska Fairbanks.

Previously, it was discovered that the frogs from eastern US and Canada could survive being frozen for only a few weeks at a temperature of about 7.2 degrees Celsius. The new research about the Alaskan frogs has pushed back the survival limits of frogs.

"If science can figure out how to freeze human organs without damage it would allow more time to reach people in need of organs," said a researcher.

It is a known fact that wood frogs can tolerate freezing atmosphere but this study is significant because it is for the first time researchers have examined the frogs under natural conditions.

In subarctic Interior Alaska, wood frogs lie dormant in the ground covered by leaf litter, creating hibernacula, which is a small cave like structure. The temperatures inside the hibernacula can remain below freezing for more than six months with minimum temperatures of minus 20 degrees Celsius.

The study aimed at finding out how long and at what temperature the wood frogs of Alaska can survive in these hibernacula.

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