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I am looking for an ID of this fly at genus or preferably species level.
Location: The Netherlands.
Size: approx. 7-8mm Habitat: indoors, attic.
Timing: usually appears late winter, early spring
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Apparently, this is a Pollenia sp https://forum.waarneming.nl/smf/index.php?topic=447650.0.

One of the common species from this genus, Pollenia rudis, is often found overwintering in groups in attics and is therefore known as the cluster fly or attic fly.

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