It flew very deliberately at the window, settling on the frame and then tapped repeatedly on the glass - going through this whole sequence several times. Barry saw them doing the same thing around this time this last year.
It seems likely that this is related to the birds starting to establish territories in the lead up to the breeding season and that, on seeing their own reflection, they mistake it for another male intruding into their territory, which they attempt to see off. .... or maybe it just wanted to come in 😊!
This behaviour can apparently also be seen in other tit species, finches, robins, wagtails and even some crow species.
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