House sparrows have been disappearing from our Capital's parks and gardens and RSPB spokesman Tim Webb said: ?Central London?s like a desert for house sparrows. It used to be full of them chirping and cheeping away. There?s a small colony on the South Bank that we?ll be showcasing to draw attention to their loss. These small garden birds have all but vanished from the heart of London, but not from the hearts of Londoners.?