At about 5:00 this afternoon while I was sitting in my backyard, I heard a steadily increasing buzzing sound above me. At first I thought it was our neighbor flying his drone over the area, but since the buzzing seemed to be coming from nearly everywhere, it must have been a huge swarm of insects. Probably bees, and according to the noise maybe even a whole colony looking for a new home. Either way, it sounded pretty impressive, if not a little threatening. My 24/7 street microphones also picked up the swarm, unfortunately mixed with the sound of passing cars.