From a few years ago. The many active Red dens I've seen. There was "always" one main entrance. I've seen 1 Red den without an exit hole. Otherwise the most exit holes I've seen at a lone den, was 11 exit holes. Inside of the main entrance hole. Is what I refer to as a "Birthing chamber". That chamber is larger then the holes. Whereas, the female/male hollowed out that area. To provide room for the litter.