Wood Frog

Wood Frog
Lithobates sylvaticus

To survive freezing in the winter, Wood Frogs accumulate urea in their tissues and glucose in their blood. These act as a kind of anti-freeze, limiting the amount of ice that forms in the frog’s body and reducing cell shrinkage and tissue damage. Wood Frogs can survive many winter freeze and thaw events as long as no more than 65 per cent of their total body water freezes.

Distribution: Canada and parts of north-eastern USA including AlaskaConservation
status: Least Concern
Evolutionary distinctiveness: Low