Arctic foxes tunnel under snow for warmth

Arctic foxes survive brutal tundra winters, where temperatures plunge to minus 50 degrees Celsius, by digging insulated tunnels under the snow. These subterranean dens trap body heat and block frigid winds, keeping the internal temperature around zero degrees Celsius. This ingenious behavior not only provides shelter but also conserves vital energy during long, dark winters when food is scarce. Researchers estimate that curling up in these snow burrows can reduce heat loss by up to 90 percent, showcasing a remarkable adaptation to Earth's harshest environments.