Along South Australia's Limestone Coast, seven greater crested terns — birds that live and breed here year-round — have tested positive or are suspected positive for H5 bird flu, suggesting the virus may no longer be merely passing through Australia on the wings of migratory visitors but quietly taking root in local wildlife. The distinction matters enormously: a disease that arrives is a visitor, but a disease that establishes itself becomes a resident, and the two demand entirely different responses. As laboratory results from CSIRO are awaited, the question before scientists, governments, a