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Nikita,

montana hints to a species living in mountains, the photo was made very far away from mountains, on the steppe region of Hortobagy.

crex,

This is part of the setup that we use for attracting moth with light, so it is really there to allow the moths to sit down on something near the light. There is a sheet to which a net is attached to make the whole structure sturdier. Very few diptera are attracted to lights, but interestingly Sciomyzidae are quite often seen.

Xespok