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Hello,

unfortunately I could only take photos from a distance of 2 m of these flies. At a sap flow of a cut branch at the forestborder (northwest Germany).

Besides some Muscina levida and a few other flies, the was a bigger male (~10 mm). I'm not sure, if I see some blue at the abdomen, which would speak for Calliphora (vomitoria?) or not.

There were many Pollenia on the wing yesterday, but on this fly pollen hides the typical scrubby thorax hairs.