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Thanks, Laurens and Theo.
I thought about Pollenia myself, but after I while a realised that Pollenia looks different, and then I started thinking about Tachinidae.
Unfortunately I didn't catch it, it escaped after I made the picture.
Maybe I will see another one the coming days, then I will try to catch one!
So for now I will keep up with the name Theo provided!
Greetings