Bird boxes
I have three bird boxes all in similar locations and facing the same direction. Why is only one ever used? Could it be something the boxes have been treated with making them unattractive to the bluetits and great tits? A suggestion for treating a new box would be appreciated.
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I've also put an open shelf like structure under the eaves of the summer house but no luck there either. A neighbour had a blackbird nest in such a site despite it being a well trafficked site so I was hopeful but again no.
I think the answer to your question is that until birds learn to talk we will never know 🐦🙂🐦