The hearts of the Alaskan wood frog actually stop while the frogs are frozen in winter, but they hop away unharmed in the spring.
Frozen Wood Frog
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Key Facts In This Video
Wood frogs live farther North than any other frog. 00:23
See a frog frozen solid at -3 degrees Celsius: 00:35
Watch a frog gradually warm and spring to life: 00:47