This Frog Can FREEZE Solid and Come Back to Life!

Across the cold northern woodlands of North America, from Alaska to the Appalachians, lives a small amphibian with an astonishing winter survival strategy. Instead of seeking deep insulation like many other frogs, the wood frog (Lithobates sylvaticus) settles just beneath the leaf litter, fully exposed to freezing temperatures for months. This seemingly perilous choice is precisely what enables its unique ability to withstand the frigid environment.

As its body begins to freeze, ice crystals form between its cells and organs, even encasing its eyes. Simultaneously, the frog's liver produces a remarkable surge of glucose, a sugar that acts as a powerful cryoprotectant. This glucose, along with urea, floods the frog's cells, preventing ice from forming internally which would cause fatal damage. This syrupy solution effectively binds water within the cells, safeguarding their integrity while the rest of the body freezes solid.

In this frozen (Review) state, the wood frog's heart stops beating, breathing ceases, and brain activity halts, rendering it clinically inanimate. Up to 70% of its body water can become ice. Yet, with the arrival of spring and warmer temperatures, the frog gradually thaws, its bodily functions restart, and it revives within a day or two, completely unharmed. This swift recovery allows it to breed earlier than other amphibians, giving it a crucial head start. This biological marvel has long fascinated scientists and offers promising avenues for research into organ preservation and diabetes treatment.