Australia has crossed a quiet but consequential line: the H5N1 virus, which has been moving through the country's seabird populations since June, has now claimed its first mammalian victim on the mainland — a long-nosed fur seal found dead near Beachport, South Australia. The discovery does not mark the beginning of the outbreak, but rather its deepening, a reminder that once a pathogen finds its way into the web of a living ecosystem, the boundaries we draw around it are rarely the ones that hold. With 297 confirmed cases nationwide and more than 13,000 seal pups already lost on a remote sub-
Australia confirms first H5N1 case in local mammal as bird flu spreads
Over 13,000 baby seals were killed by the virus on Heard Island; ecological impact on marine mammal populations remains under assessment.