South Australia has recorded the first confirmed death of an endangered Australian sea lion due to H5 bird flu. The sea lion was found dead at Seal Bay on Kangaroo Island, which is home to the third-largest colony of the species. The state’s environment minister, Emily Bourke, explained that the animal had been recovering from a shark attack but ultimately succumbed to the virus. She noted that no other deaths of endangered sea lions had been recorded at Seal Bay, though the government is closely monitoring the population. The Australian sea lion is a rare and protected species, with estimates suggesting there are fewer than 10,000 individuals remaining. The majority of the population is found in South Australia, with smaller numbers in Western Australia. Seal Bay, a key breeding site, is estimated to host around 800 sea lions, but the population is already declining by 2% annually—before the recent threat of bird flu. Bourke mentioned that there is currently no approved mammal-specific vaccine for H5 bird flu, although it has been used in cattle in the United States and tested on monk seals in Hawaii. South Australia has expressed willingness to participate in a potential vaccine trial to protect its sea lion population. She highlighted the severity of the situation, noting that Heard Island, a remote sub-Antarctic territory, experienced a 75% drop in seal pup numbers due to the virus, with global reports indicating even higher losses in some areas. John Woinarski, a leading mammal scientist at Charles Darwin University, warned that the virus could spread rapidly among sea lions in South Australia due to their proximity to seabird colonies, which are often affected by the disease. He emphasized the potential for a "serious conservation impact" if no effective measures are taken to control the spread of H5 bird flu. H5 bird flu has previously caused catastrophic losses in pinniped populations in South America and sub-Antarctica, especially among young pups. South Australia confirmed the first case of the virus in a mainland Australian mammal in August, when a dead long-nosed fur seal found at Beachport on the Limestone Coast tested positive for H5N1. This new development adds urgency to the efforts to protect the vulnerable Australian sea lion population.