House Beautiful on MSN
The 4 bird box mistakes that could put nesting blue tits and robins at risk
The wrong entrance hole, poor insulation or bad placement can turn a nest box from safe haven to hazard ...
https://siris-libraries.si.edu/ipac20/ipac.jsp?&profile=liball&source=~!silibraries&uri=full=3100001~!358187~!0#focus ...
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