i couldnt work it out untill i realised that happens on our back doors, a tawny owl tried to go through two living rooms once, nice one ?a collared dove,
I came home a few weeks ago to find a similar mark on our kitchen window and to see a sparrow hawk fly away from a wood pigeon it was feeding on in the back garden. Tried to take a photo of the mark on the window but it didn't come out as well as your one.
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