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I, myself, have found that NO box I have offered will stop a HOSP if it really wants it other than a hole which is too small. But that would defeat the whole purpose of offering boxes to the Blues in the first place. The only thing that has shown to be IMO 98% fool proof is a sparrow spooker after the first egg is laid. One must remove the spooker after fledgling to prevent those little rat birds from losing their fear of the spooker. Also, I have found that a combination of a spooker AND a wren guard provides double protection against HOSPs. I’ve never used a spooker on a DEE nesting so can’t comment on that.
When the new wears off the old shines through
When The New Wears Off The Old Shines Through.