Of 1,235 individual birds from 130 species tested for haemagglutinating virus and/or NDV antibody in far northern Queensland, none gave a positive response. On available evidence pittas and rainforest pigeons are considered the species most likely to bring virulent NDV into Australia followed by gulls and night herons which move between dense seabird breeding colonies and other avian communities. Both can easily be monitored by strategic sampling along migratory pathways or at breeding islands. Wild parrots, waterfowl and migratory waders appear to present a minimal threat.