Dumb birds
No, angry feminist mob, the other kind.
One of the best things about living here is we're surrounded by scads of wild birds, butterflies ad nauseam, and other living goodness despite being a lot closer to the city centre than we were in Sheffield.
Perhaps there are too many birds? I was happily working away and heard a loud thump against the window. Looking up to see if it was ejecta from the as-yet-undetected volcano my paranoia tells me we are living on top of, I saw a reasonably big bird in the process of bouncing off the glass and getting its balance back.
It flew away successfully, so presumably its window issues will be bred into the next generation. Evolution loves a survivor.
If only the cicadas of this world could be persuaded to off themselves in this fashion. I wouldn't mind wiping them off the windows, I really wouldn't.