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Hi Theo.
Thank you very much.
It is very strange, I made 41 pics over 14 minutes and to my knowledge, it is the same fly on all. When looking from above, it was black with no markings visible, looking from behind, I could se the crown on thorax, and the black abdomen turned like pic3.
It demonstrate one of the problems in just taking pictures and not catching the fly.
Thanks again!