I will need to have buzzing flies in a couple of scenes in my film-- would that be hard to do with CG? Could I use some particle system, create some fly 'particle' in Blender/Maya and tell my particle software to use that? Other solutions? Lure real flies in using honey or something else? One scene would be flies buzzing over a bed in a bedroom, another of flies buzzing around a car trunk and with a few flies sitting on the car trunk (the rear storage area of the car, not the bonnet those of you in the UK might call it).