Just witnessed a large group (around 5-10) of blue tits feeding in and around the tree where the bird box is located. Several of them looked inside and one of them flew in. So now it is clear to me that many birds at least investigated the box.
I was able to capture some images of characteristic birds. The one below has a distinctive marking above his left eye
…and the one below (that actually flew into the box) had a small rather narrow line on his forehead
So now it is clear that many birds visit or investigate the box. The only thing I’m still wondering about is if the blue tit that I have seen roosting in the box is always the same one…
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