I had some maggots from the spring sitting inside my refrigerator, in a small compartment. I hadn't looked in there since about mid-April. Usually when maggots sit in there for awhile, they turn black and die. Well, I knew I had some wax worms in the same compartment, so I open it up. Inside the maggot container, there are about 20 black flies buzzing and trying to get out. It was one of the weirdest things I've ever seen. How did this happen, and the maggots just didnt' die like usual? Sorry, I guess I should have paid more attention in biology class.