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Biology

The Physiological Mechanisms of Freeze Tolerance in Wood Frogs

Quick fact

Wood frogs can survive being frozen up to 65% of their total body water, with no heartbeat and no breathing, for weeks at a time, and then thaw out and resume normal life within hours.

Why this is interesting

Imagine being frozen solid for weeks, then waking up just fine. Wood frogs do exactly that every winter—how is that possible?