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Nikita

Is it just megacephala that gather and lurk like this, or do other Chrysomya do it too? I've seen gatherings like this in Central Australia, of metallic green flies that I assumed were Chrysomya, on twigs and grass stalks by dung (horse) or a carcass (snake) but do not know what species and didn't have a good enough camera to get a photo at the time.