Devastating Avian Flu Outbreak Claims Thousands of Seal Pups in Subantarctic Islands

A lethal strain of avian influenza has severely impacted wildlife on the remote Heard and McDonald Islands near Antarctica, leading to the deaths of approximately 13,000 seal pups, along with penguins and seabirds. Drone surveys conducted by the Australian Antarctic Program revealed alarming images of deceased seal pups scattered along the islands' volcanic shores. The mortality rate among southern elephant seal pups has reached 76% in a population of 17,000, with some areas reporting up to 97% mortality. This outbreak marks the first detection of the H5 strain in Australian external territories, highlighting the virus's eastward spread in the subantarctic region. The findings, which are yet to undergo peer review, suggest the virus likely arrived from the Crozet Islands, approximately 1,800 km away, around August 2025.

Key Details: • Approximately 13,000 seal pups have died due to avian influenza. • Mortality rates for southern elephant seal pups reached as high as 97% in some areas. • The outbreak is the first detection of H5 avian flu in external Australian territories. • The virus likely spread from the Crozet Islands, located 1,800 km away.