I have a bird table in my back garden for attacting birds. Mostly it attacts pigeons, not that I mind particularly. Last Thursday, I arrived home to find the back garden covered in pigeon feathers -- big ones and all the downy ones. No sign of a carcus, but obviously one of the cats or a fox struck lucky.
Anyway, on to the point... What I have noticed is that since Thursday, there's not been any pigeons in my garden, nor can I see any for several garden's radius. There are normally always a few to be seen in the trees and rooftops. Even the two magpies which were around have vanished. Also, the food on the bird table which normally lasts only half a day hasn't been touched since then, so much so that spiders have built webs across the bird table openings which haven't been disturbed.
I guess I'm rather amazed that the birds were apparently so truamatised by the capure of one of them that they've left the area. I went round the lawn with the mower at the weekend, mainly to suck up all the feathers, but even now they're all gone, still no birds. This perhaps implies a higher level of awareness than I would have previous attributed to the birds.