"There are [...] certain species of animal that can endure far greater spells of cold. The Arctic ground squirrel normally maintains a body temperature similar to our own. But during hibernation, it can survive a core temperature as low as –3°C, carefully managing its super-cooled bodily fluids so that it won’t freeze solid. And Lovelock’s hamsters could survive hypothermic depths that would kill us. How animals survive these states is of great interest to anyone hoping to unlock the secrets of suspended animation for humans."