Along Australia's southern coastline, a cluster of seabirds has become the latest chapter in the long, unresolved story of H5N1 avian influenza — a virus that has been quietly reshaping the relationship between wild animals, domestic agriculture, and human health for more than two decades. Seven greater crested terns found dead on South Australia's Limestone Coast are now suspected carriers, bringing the country's potential tally to 27 since the virus first appeared on the mainland in June. Authorities are watching carefully, knowing that the birds themselves are the earliest and most honest s