Frog can survive being frozen


There are five known species of freeze-tolerant frogs in North America, including the well-studied wood frog, as well as Cope’s gray tree frog, the eastern gray tree frog, spring peepers and the western chorus frog.

When ice starts form in the skin, a wood frog’s liver converts sugars, stored as glycogen, into glucose. This sugar is released from the liver and carried through the bloodstream to every tissue where it helps keep cells from completely dehydrating and shrinking.