As winter approaches in Alaska, wildlife must contend with deep snow, scarce food and extreme cold. Snowshoe hares, caribou, ermine, bears, moose and ground squirrels rely on different strategies, from growing thick fur and storing food to building shelters and hibernating. Alaska-based Photo Expedition Leader Laura Geissinger, an environmental scientist and educator, explains how these adaptations help animals endure the season—and how changes in weather, habitat and food availability can affect their survival.