Some blue tits have nested in my redundant overflow pipe and I've seen them to-ing and fro-ing in the garden. On Saturday and again this morning (both sunny days which is possibly relevant) they have been knocking on my kitchen window with their beaks. They look very cute doing this.
I googled, and according to the RSPB they are tapping because they can see their reflection in the window so they think it's another blue tit. They didn't do it yesterday when it was a grey cloudy day so the reflection bit makes sense, but anyone else had this?
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