Researchers report a catastrophic collapse of chinstrap penguins on Zavodovski Island, the site of the world’s largest penguin super-colony in 2011. Between 2011 and 2025 the chinstrap population fell by about two-thirds, a loss equivalent to roughly half a million breeding birds; the island formerly held about 600,000 chinstraps and 90,000 macaroni penguins and has likely lost its top spot to Cape Adare. The findings, published in Current Biology, characterize the decline as rapid and sustained rather than sudden, prompting calls to consider reclassifying the species as endangered if trends continue.
Scientists attribute the crash primarily to climate-driven changes in ocean temperature and prey distribution. Tracking shows chinstraps forage in cooler north‑west waters to feed on Antarctic krill, but warming seas have pushed krill south into the Weddell Sea, reducing food availability for this specialist predator. Macaroni penguins, which are less diet-restricted, rose about 30%, but not nearly enough to offset chinstrap losses. Other hypotheses - local volcanic ash from a 2016 eruption, human disturbance, or interspecific competition - were discounted by the data. Researchers warn that removing such a large component of the food web raises the risk of broader ecosystem collapse.
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