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Hi Sven.
Thank you very much for your message.
I´m just an amateur, and don´t know how to handle this. I have pictures of what I think is this species on the danish homepage https://www.fugleognatur.dk/gallery.asp?mode=species&ID=13214 and have more photos of them, - I do not catch the flies.
Would you take a look on the photos?

Kindly regards Ruth