These tiny USDA approved insects are the natural enemy of flies. Fly Exterminators do not bite, sting, swarm or bother humans or animals. Fly Exterminators are nocturnal, flying 8-10 inches off the ground and are rarely seen during the day.
Fly Exterminators control flies in animal manure accumulations and other filth fly breeding sites. Effective against; houseflies, biting stable flies, garbage flies and the lesser housefly, which make up 95% of flies.

(Muscidifurax raptorellus)
Fly Exterminator aka Fly Parasite