Wood Frogs: Cryogenics at Work

Found in moist North American woodlands, wood frogs are forest-dwelling amphibians notable for their resistance to freezing. During cold spells, the frogs’ liver glycogen is converted in large quantities to glucose in response to ice formation in their tissues. The glucose acts as antifreeze, inhibiting ice formation in cells, which would otherwise rupture. If ice formation is confined to extracellular fluids, the frogs are able to survive the winter. In what unique place do wood frogs breed? Discuss

Source: The Free Dictionary