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I’m not against them at all, but like you just don’t understand why more people don’t use them if they are house sparrow resistant. I can see where a bluebird can escape easier but like I’ve said it also ads more entryways for a HOSP. Kind of like a house with a front and back door. If you don’t want intruders you have to lock both. I don’t know of any other reasoning but I may try to do some googling later.
Then, I wonder how easy trapping with a Van Ert is? And would a 13 g. garbage bag fit around the two holed mansion? Those are my concerns.
Besides an extra hole for escaping, what do you like about it compared to one-holed boxes? I’ve never even actually seen one except online.