We had a batch of youngsters that tried to take up residence in the nest boxes. Curtains didn't deter them, as they seemed to be searching for a safe place out of site from the older flock that they joined. But with some 'guidance' they got the picture. We had a nesting box unit attached externally with its own external, hinged lid. So I just went out there after dusk and booted any nesting box birds out. Sometimes repeatedly. But they got the picture and quit the crap.:)
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