It is the first time an Australian native bird has tested positive for H5N1 bird flu in NSW. Two deceased greater crested terns have tested positive for bird flu in NSW. Related Article Bird flu ‘List of doom’: Bird flu puts one in five Australian bird and mammal species at risk The NSW government said surveillance work would continue at the sites to ensure early detection of any further cases. “These positive cases are not unexpected,” NSW Environment Minister Penny Sharpe said. In total, four birds in NSW have returned a positive result for H5N1 bird flu, with the first two being migratory petrel birds found near Port Stephens in early July.