Wood frogs are the most widely found frogs above the Arctic Circle. Wood frogs have found a very cool way to stay alive in the severe cold of the Arctic Circle. If the temperature drops, the Wood Frog will go bury itself and then shut itself down. And if the temperatures get harsher, the frogs create glucose in their liver by breaking down glycogen using enzymes. This glucose goes out into their body organs and is spread out throughout the bloodstream. Since there's so much glucose in the Wood Frog's system, their organs can't get damaged because the sugar in their blood acts like anti-freeze. They can stay totally frozen for two weeks or more. They stay frozen for as long as the temperature of the ground is below freezing. The Wood Frogs temperature is the same as the environment they are in. When they thaw out, they just continue on with their life. The first thing that happens when they thaw is the heart starts beating. Then they start gulping air and shaking out their limbs. When the frog is fully recovered, he is just like he was before freezing. The next thing the Wood Frog does, is find the nearest breeding pond. The wood frog breeds only for a few nights, sometimes only in one night.