In September, the wood frogs of Alaska do a very strange thing: They freeze.
They do not freeze totally solid, but they do freeze mostly solid. Two-thirds of their body water turns to ice. If you picked them up, they would not move. If you bent one of their legs, it would break.
Inside these frozen frogs other weird physiological things are going on. Their hearts stop beating, their blood no longer flows and their glucose levels sky rocket.
Wood FrogfrogamphibianLee FoxAlaskafrozennature