IUCN Upgrades Emperor Penguins to Endangered Status Due to Sea Ice Loss

The International Union for Conservation of Nature (IUCN) reclassified emperor penguins (Aptenodytes forsteri) from threatened to endangered status on April 9. This upgrade indicates the species faces a very high risk of extinction in the wild. The decision stems from ongoing sea ice loss around Antarctica, which disrupts breeding and chick survival.

Emperor penguins rely on stable fast ice—immobile sea ice—for breeding and raising young. Over the past decade, Antarctica has recorded record lows in sea ice extent, with breakup occurring earlier in the year. This premature ice melt exposes chicks to drowning or freezing, as they lack waterproof feathers.

In 2022, satellite observations documented the collapse of five emperor penguin breeding colonies near the Bellingshausen Sea. The event resulted in the loss of approximately 10,000 chicks. Science News reported these details based on satellite data.

Current global emperor penguin populations stand at about 595,000 adults. This represents a decline of 10 to 22 percent since 2009. Projections indicate the population could halve by 2080 under continued climate trends.

The IUCN also reclassified Antarctic fur seals (Arctocephalus gazella) to endangered status.

In 1999, the species was listed as of least concern with an adult population of around 2,187,000. By 2025, the population had decreased to 944,000. Rising ocean temperatures and shrinking sea ice have driven this decline.

These changes push the seals' primary food source, krill, to deeper waters. Consequently, first-year pup survival rates have fallen sharply.

The IUCN Red List is maintained by a network of about 17,000 scientists and experts from over 160 countries.