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Thank you for the clarification!

It looks like my retired mum does a good job, hah. All the posted pictures here were taken by her. She tries to identify the species by herself, but obviously it has to be checked out by the specialists. Consequently, I'm bothering you up here, hah

Regarding your Polish, you are doing well, respect! :)

If you want to practice your Polish skills, hah, feel free to check out the website - this is what my mum found in our family garden in the past 3 seasons:

http://bartnapierala.com/atlas/?fbclid=IwAR1tHaxYdJJnYQSov2rifxPRPkzuUJ8tlr-ywKX4v68KdIxVnRMyV2uUocY#!/gatunek/48#view

Fingers crossed for the first record of Bibio femoralis in the NL!