Sulphur-crested cockatoos are some of the nation's smartest and most destructive birds. They are known to open the lids of wheelie bins, flicking rubbish everywhere while rummaging for food. They are notorious for destroying wooden window frames, decking or house fittings. They lop the tops off flowers, uproot seedlings, hollow out trees and generally make a big old mess. We head to Katoomba in the Blue Mountains in search of Australia's naughtiest bird