In the silence of the Alaskan interior, where the mercury frequently plunges below -40 degrees Fahrenheit, the landscape becomes a graveyard of frozen organic matter. Yet, beneath the leaf litter and the insulating blanket of the subarctic snowpack, a biological miracle occurs annually. The wood frog (Lithobates sylvaticus) is the only amphibian known to inhabit territories north of the Arctic Circle, pushing the boundaries of vertebrate physiology to their absolute breaking point. Recent longitudinal studies conducted over the past year have begun to unravel the complex biochemical signaling that allows these small creatures to survive months of being, quite literally, as solid as a block of ice. Herpetologists have long been fascinated by the wood frog’s range, which stretches from the southern Appalachian Mountains all the way to the Brooks Range in Alaska. However, it is the northernmost populations that have recently yielded the most significant data. These high-latitude individ...