A deadly strain of avian influenza, H5N1, that has killed millions of wild and domestic birds and mammals across the globe, has for the first time reached Australia’s shores. Australian authorities confirmed that two migratory seabirds, a brown skua (Stercorarius antarcticus) and a northern giant petrel (Macronectes halli), have both tested positive for H5N1, a strain of what’s officially known as highly pathogenic avian influenza (HPAI). The sick birds were discovered along the southern coast of Western Australia. They have since died. Both the brown skua and giant petrel breed in the subantarctic regions and migrate to northern, warmer waters, including those around Australia, during the harsh polar winter. Bird flu is caused by a highly contagious virus that has now infected animals on every continent. Sporadic human cases have also been recorded. Federal Agriculture Minister Julie Collins said in a press briefing that there is no evidence of mass mortality in Australian wildlife and that bird flu hasn’t as yet affected Australia’s poultry or livestock. As of March 2026, the highly contagious H5N1 bird flu virus strain has infected more than 560 wild bird species and more than 100 species of mammals, according to the U.N. “We can’t overstate how significant this moment is for Australian wildlife,” BirdLife Australia CEO Kate Millar said in a statement. “This virus has devastated wildlife populations overseas. This could be the beginning of a long fight to protect birds and wildlife in Australia.” Avian influenza viruses are common in their natural hosts —…This article was originally published on Mongabay

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