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I have a Bird's nest (European Robin) in my garage that I need to remove. Chicks were successfully raised this summer, and the nest is still in use.

What I am thinking is that it could be interesting to dismantle the nest and look for dipterans. So what would be best time to do it?

I will not interfere when/if there are eggs or chicks, on the other hand I am hesitant to let them keep the nest one more season. I have to leave my garage door open for this.

Also, what diptera families could I find? And are the chances good enough to find ANYTHING that is is worth tha hassle?

Any opinion on the matter would be much appreciated.