Everyday life for Parisians became increasingly difficult during the siege. In December temperatures dropped to , and the Seine froze for three weeks. Parisians suffered shortages of food, firewood, coal and medicine. The city was almost completely dark at night. The only communication with the outside world was by balloon, carrier pigeon, or letters packed in iron balls floated down the Seine. Rumours and conspiracy theories abounded. Because supplies of ordinary food ran out, starving denizens ate most of the city zoo's animals, then resorted to feeding on rats.