Yesterday a dove banged mid-flight against my living room window. Don't worry, it flew away. Likely with a concussion. But it is a city dove, so probably no difference there. :P
You can clearly see the contour of that bird plastered on my window. I can easily see the wingspan, it's quite a nice sight. Alas, it doesn't take well to camera, it's barely visible if at all on screen.
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@trinsec This happens about 3 to 4 times a year on our back garden window. I deduce that at certain sun angles and intensity the 'glass' is not visible to bird. We cal it the 'ghost impression' as the oil from the wings changes colour as it thins out due to wavelength refraction (like oil on street).
