After my rescue of the pranged nightingale, I spotted the imprint it had left on the window. It's not as well defined as the ones from robust pigeons flying headlong into glass, but as this one appeared to stun itself, I thought it worthy of a snapshot.
Somebody will know what the coating is that the birdies have which makes the marks, but I'm not convinced the mark on the window does anything to stop other birds from accidentally flying at the same glass.
My theory is that the bird can see through to another part of the house with a window and thinks its a safe flight path.
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