love this story - it was also on the BBC documentary series Earth from Space... you can actually see the green of the birds feeding en masse from space amidst the buildings.. We have the same species of parakeet here in West London they do come to some trusted people around the neighbourhood to feed but my cats put them off coming close to my house.... they don't half chatter and are quite cheeky so can imagine the sound of 8,000 of them....