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In Shetland this week there have been a load of racing pigeons that have been grounded for some reason. Eliminating feral pigeons when they are still effectively being imported would be a bit pointless.
My rule for years has been that you need to see a flock that looks all pure or at least 95% - so no more than one wandering duffer in 20 - usually get that around Hillswick, but Lerwick is as bad as Trafalgar Square. It doesn't really matter as Feral Pigeon is a legitimate year-tick.
Go to Israel and you can see flocks of hundreds or even thousands all alike - but theirs don't have a white rump. Weird.