Wood Frog

Freezes solid in winter with 65% of body water turning to ice, heart stopping, brain activity ceasing - by every medical definition, dead. Survives through controlled freezing: liver produces 100× normal glucose as antifreeze, ice forms between cells but not inside them. Thaws in spring with full function restored within 24 hours. Cost: emerges with 70% energy depletion. Demonstrates selective freezing - controlling where freezing occurs rather than preventing it entirely.