Fox dens are ten degrees cooler than city streets
While urban asphalt absorbs and traps blistering heat, these subterranean tunnels offer a natural cooling system that protects vulnerable pups from lethal temperature spikes.
Deep beneath the vibrating pavement of London and Berlin, red foxes have engineered an invisible network of climate-controlled bunkers. While the asphalt above can reach temperatures high enough to fry an egg, these subterranean dens remain a steady 5 to 10 degrees Celsius cooler than the surface air. By tucking their homes under railway embankments or the concrete slabs of abandoned construction sites, foxes exploit the heavy insulation of the earth. This thermal buffer acts like a natural air conditioner, dampening the swings of the city's intense heat islands.