Australia faces escalating H5N1 bird flu threat as virus spreads to wild birds

Australia is entering a high-risk phase of the H5N1 bird flu outbreak, with confirmed cases in wild birds and potential threats to native fauna and mammals, prompting urgent conservation measures.

Australia is entering a high-risk phase of the H5N1 bird flu threat, with the virus now confirmed in resident wild birds after arriving via migratory species. Officials and researchers warn that the pathogen is capable of moving on to mammals as well, raising the prospect of significant losses across native fauna.

The scale of the risk is stark. Avian influenza can kill between 75% and 100% of some poultry and wild bird populations, and the Department of Agriculture says the virus has already shown its capacity to affect wild birds, mammals and domestic animals overseas. The Australian Centre for Disease Control is advising people to avoid contact with sick or dead birds and to report sightings to authorities.

Wildlife groups say threatened species such as black swans, eagles, quolls and Australian sea lions may be especially exposed, while more common birds could also suffer sharp declines. Western Australia recorded H5 avian influenza in a migratory seabird on its south coast in June 2026, underscoring how quickly the outbreak can move.

Conservation scientists argue Australia is not powerless. They want stronger predator control, protected insurance populations, vaccination trials, expanded monitoring and research, and tighter management of water sources and public access. The challenge, they say, is to slow the spread before the virus becomes entrenched in the continent’s wildlife.