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Ah well the problem with this kind of group shot is that you don't get as many details for identification as you would when zooming in on a single fly. Thank-you Tony and Theo for the comments. I am slowly learning what characters to look for!

Question: Is it generally safe in Muscidae and Calliphoridae to say that the flies with the eyes touching up above are males, and if the eyes are well-separated they are females? I have never been clear on which families (if any) this rule is true for.