The ones in Melbourne were found dead - they had received massive publicity over many years, nesting in a Collins Street building - and it is believed they were killed following the poisoning of pigeons. Prior to that, the council had employed an expert pigeon person from the UK who had recommended not poisoning the pigeons. Well, that money was wasted. The pigeons were poisoned and the Peregrine Falcons died. I've always recommended poisoning councillors. I still do. But they don't die. Like pigeons. Or Peregrine Falcons. Some more have cropped up in Ballarat. There are not many left.