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During winter, we wear sweaters to keep us warm. Sometimes, we also light a fire. But, unlike us, the wood frog freezes itself to escape the harsh weather.

The wood frog, found in North America, is known to freeze through winter. It organs pump water that fills up every little cavity in the body. Gradually, 65 percent of the water turns into ice. Subsequently, the frog’s breathing and hearing stop. 

The fogs have a substance in its body that lower the freezing temperature, preventing them from completely becoming frozen and dying. During the frozen hibernation, the frog’s body temperature remains between -1°C and -6°C. Moreover, the metabolism of the frog drops, helping it survive without food.

During spring, when the temperature raises, the ice inside the frog’s body melts. The water flows back into the cells and blood starts flowing again. Slowly, the frog returns to its normal state.