
The little chap is seeking a mate and this is his way of doing it. It is as if he's saying: "This could be our new home! It's vacant; let's build a nest here. Come and join me!"
There was a great tit harassing him the last time; tits are quite territorial, so this must be that great tit's patch (though the opening in our nest-box is too small for great tits to fit in).
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