Bird Flu in Antarctica: Wildlife Deaths & Scientist Warnings

Antarctica, long considered a remote and pristine wilderness, is now experiencing its first confirmed outbreak of highly pathogenic avian influenza (HPAI), commonly known as bird flu. The virus, specifically the H5N1 strain, has been identified as the cause of a die-off of more than 50 skuas – large, predatory seabirds related to gulls – during the summers of 2023, and 2024.

The findings, recently published in Scientific Reports and initially reported by researchers at the University of California, Davis and Erasmus MC in The Netherlands, mark a significant development in the global spread of H5N1. While the virus has been circulating in various parts of the world, impacting poultry and wild bird populations for several years, this is the first documented instance of a wildlife die-off attributed to H5N1 in Antarctica. The initial detection of the virus in Antarctic birds occurred earlier in 2024, with H5N1 identified in a kelp gull and two skuas in January and February, but confirmation of the virus as the cause of death was only recently established.

Skuas as Primary Victims

Skuas appear to be disproportionately affected by the outbreak. Researchers focused their investigations on skua breeding colonies at ten sites across Antarctica, including locations in the South Shetland Islands, the northern Weddell Sea, and the Antarctic Peninsula. The most significant die-off occurred on Beak Island, where a substantial number of skuas succumbed to the virus. While penguins and fur seals were also examined, these species have not shown the same level of susceptibility to H5N1, at least based on the data collected so far.

The reason for this vulnerability in skuas may be linked to their scavenging behavior. As both predators and scavengers, they frequently feed on carcasses, potentially increasing their exposure to the virus. This behavior also raises concerns about their potential role in spreading the virus further across the Antarctic continent.

Neurological Symptoms and Rapid Disease Progression

The skuas that died exhibited severe symptoms, including neurological signs such as twisted necks, circling behavior, and, in some cases, falling from the sky. According to researchers, the birds experienced rapid disease progression, with multi-organ necrosis – the death of tissue – occurring quickly after infection. The virus appears capable of causing a high mortality rate, with some areas experiencing the death of 90 to 100 percent of the local skua population within a short period.

Global Implications and Concerns

The emergence of H5N1 in Antarctica is not an isolated event. The same strain of the virus has been responsible for significant outbreaks in other parts of the world, including mass die-offs of sea lions in Argentina and Chile, and the culling of over 400 million poultry globally. It has also been detected in mammals such as cows, mink, and foxes, and has even caused infections in humans, though these remain rare.

“We let the virus slip out through our fingers when it first emerged in the poultry industry,” stated Thijs Kuiken, DVM, PhD, of Erasmus University, highlighting the long-standing concerns about the global spread of H5N1. The virus’s ability to jump species and establish itself in new environments underscores the need for continued surveillance and preventative measures.

Limited Antarctic Ecosystem Vulnerability

The Antarctic ecosystem is particularly vulnerable to outbreaks like this due to the limited population sizes of many species. For example, Antarctic cormorants and skuas each have total populations of around 20,000 individuals. This small population size means that even a localized outbreak can have a significant impact on the overall species numbers.

Victor Neira, a researcher at the University of Chile and the Chilean Antarctic Institute, noted that the virus has spread throughout the Antarctic region accessible to researchers. February 17, 2026, Neira told AFP that the detected strain is “capable of killing 100 percent of infected fauna.” Recent expeditions have confirmed cases in Antarctic cormorants, kelp gulls, Adelie and gentoo penguins, and Antarctic fur seals.

Ongoing Monitoring and Future Research

Scientists are continuing to monitor the spread of H5N1 in Antarctica and are working to understand the potential long-term consequences for the region’s wildlife. The remote and challenging environment of Antarctica makes surveillance and research difficult, emphasizing the importance of international collaboration and continued investment in scientific monitoring programs. The current situation highlights the interconnectedness of global ecosystems and the need for a proactive approach to preventing and managing infectious disease outbreaks.

The findings underscore the importance of continued vigilance and research to understand the evolving threat of avian influenza and its potential impact on vulnerable wildlife populations worldwide.