In the frozen wilderness of Alaska, wood frogs survive winter using one of the most extraordinary biological tricks in the animal kingdom: they freeze solid. Their hearts stop beating, their blood turns to ice, and their bodies enter a suspended state until spring returns—when they thaw out and come back to life. Important Details: • Up to 70% of the frog’s body water freezes during winter hibernation • Their liver produces large amounts of glucose, which acts like antifreeze to protect cells •