Emperor Penguins Join Endangered List as Sea Ice Continues to Disappear
Emperor penguins have been classified as endangered after satellite data revealed a rapid population decline driven by vanishing Antarctic sea ice, the International Union for Conservation of Nature announced.
The IUCN, which maintains the Red List — widely regarded as the most comprehensive global inventory of conservation status for animal, fungus and plant species — also classified Antarctic fur seals as endangered and reclassified the southern elephant seal as vulnerable as environmental pressures across Antarctica intensify.
Emperor Penguins Are Rapidly Disappearing
Satellite data indicates emperor penguin populations declined by approximately 10% between 2009 and 2018, representing more than 20,000 adult birds, according to the IUCN. Projections suggest the population could be reduced by half by the 2080s.
The picture has only worsened in recent years. WWF-funded research using satellite imagery estimates a 22% population decline in Western Antarctica between 2018 and 2023, exceeding previous model predictions.
Emperor penguins depend on stable Antarctic sea ice for breeding, raising chicks and molting for at least nine months of the year. But since 2016, sea ice levels have declined significantly. In 2022, four out of five known breeding sites in the Bellingshausen Sea experienced collapse, resulting in thousands of chicks freezing or drowning.
“After careful consideration of different possible threats, we concluded that human-induced climate change poses the most significant threat to emperor penguins,” said Philip Trathan, at the British Antarctic Survey, and a member of the IUCN Species Survival Commission, in a statement. “Early sea-ice break-up in spring is already affecting colonies around the Antarctic, and further changes in sea-ice will continue to affect their breeding, feeding and moulting habitat.”
Emperor Penguin Face Breeding Failures Across the Continent
A 2025 study involving researchers Sharon Robinson and Dana Bergstrom further documented widespread breeding failures across emperor penguin colonies.
“Of the 60-plus known emperor colonies around the coast, about half have experienced increased or complete breeding failure events since 2016 due to early fast-ice loss, and 16 colonies have suffered two or more such events,” says Bergstrom. Fast ice refers to sea ice that is attached to the coast or seabed.
“This adds an Antarctica-wide context to the more extreme picture occurring on the Antarctic Peninsula, where we have seen chicks drown through early sea-ice breakout,” she says.
Research from Robinson at the University of Wollongong indicates emperor penguins may be among the most threatened Antarctic species. In 2022, she and colleagues assessed extinction risk, projecting potential extinction by 2100.
“As global heating warms the oceans and melts the sea ice, this removes the breeding places which allow emperors to reproduce successfully,” Robinson said in a statement. “Like most birds and mammals, penguin chicks need a safe place to develop, and human actions are removing that stable platform at a rapid pace.”
Other Antarctic Species Under Threat
Emperor penguins are not the only Antarctic species facing steep declines.
The Antarctic fur seal population has declined by more than 50%, falling from over 2 million mature individuals in 1999 to 944,000 in 2025, with climate change cited as a key driver.
Southern elephant seals are also experiencing population stress, with avian flu contributing to high mortality rates. The IUCN reported that the virus is killing more than 90% of newborn pups in some colonies.
Calls for Urgent Climate Action
The World Wide Fund for Nature is urging governments to limit global warming to 1.5°C and to designate emperor penguins as a Specially Protected Species at an upcoming Antarctic Treaty Meeting in Japan.
The organization emphasized that the future of emperor penguins is closely tied to climate action, stating that reducing reliance on fossil fuels and limiting global temperature rise to as close as possible to 1.5°C is critical to preventing further losses.
The updated classifications underscore how climate change is reshaping life across Antarctica, threatening species that have thrived on the continent’s ice for millennia.
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