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Why Zavodovski Island’s Penguin Colony Lost Its World-Record Status
Zavodovski’s chinstrap population fell from about 1.09 million breeding birds in 2011 to 402,000 in 2025, and occupied nests declined 63%.
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- Zavodovski’s chinstrap population fell from about 1.09 million breeding birds in 2011 to 402,000 in 2025, and occupied nests declined 63%.
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openai.comCreate a landscape editorial hero image for this Studio Global article: What did the British Antarctic Survey–led study published in Current Biology on October 7 reveal, using drone and satellite imagery, about Z. Article summary: The October 7 study found that Zavodovski Island has lost its claim to be the world’s largest penguin colony: drone and satellite surveys put its breeding chinstraps at about 402,000 in 2025, down from 1.09 million in 20. Topic tags: general, government, education, general web, news. Style: premium digital editorial illustration, source-backed research mood, clean composition, high detail, modern web publication hero. Use reference image context only for broad subject, composition, and topical grounding; do not copy the exact image. Avoid: logos, brand marks, copyrighted characters, real person likenesses, fake screenshots, UI text, readable text, watermarks, c
Drone and satellite surveys show a dramatic change at Zavodovski Island in the South Sandwich Islands: between 2011 and 2025, occupied chinstrap penguin nests fell by 63%. Estimates of breeding chinstraps dropped from about 1.09 million to 402,000—a loss of more than 680,000 birds. The decline has ended the island’s claim to the world’s largest penguin colony. 9
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What the surveys found
The British Antarctic Survey-led research compared aerial and satellite imagery from different years. The figures describe two related measures: occupied nests were down 63%, while estimates of breeding chinstraps fell from roughly 1.09 million individuals in 2011 to 402,000 in 2025. 11
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The scale of the change is striking, but the comparison is between survey periods—not a direct count of every bird that disappeared. The results document a major decline at Zavodovski; they do not, by themselves, establish the cause of each loss.
Why researchers suspect changing krill availability
Researchers point to warming-related changes in the Southern Ocean food web as the likeliest explanation. Chinstraps depend heavily on krill, and shifting krill distribution could make food harder to find near their breeding grounds. The birds cannot simply follow prey to another area to breed: suitable nesting islands are limited, and sea ice can complicate access. 9
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The explanation remains a hypothesis rather than proof that climate-driven krill changes account for every part of the decline. Researchers also considered Mount Curry’s 2016 eruption and competition with recovering humpback whales, but these factors were not considered as good an explanation for the different trends in the two penguin species on the island. 9
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Macaroni penguins increased as chinstraps declined
The island’s other penguin species moved in the opposite direction. Breeding macaroni penguins increased from about 338,000 to 433,000 and now outnumber chinstraps at Zavodovski. Researchers suggest that macaroni penguins may benefit from feeding in warmer waters to the northeast and potentially eating a broader range of prey. That possible advantage contrasts with chinstraps’ greater reliance on krill. 12
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The contrast is important: the island’s overall penguin story is not a uniform decline, but a shift in which species is most numerous. Researchers see the difference as a clue to how changing food availability may affect species in different ways. 12
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What the decline could mean for chinstrap conservation
The South Sandwich Islands are estimated to hold about 38% of the world’s chinstrap penguins, making declines in the archipelago a concern beyond Zavodovski. 12
13 Researchers have called for a reassessment of the species’ IUCN conservation status, from “least concern” potentially to “endangered.” That is a recommendation to review its status, not an announced change in classification.
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The concern also fits with earlier research describing declines in chinstrap penguins on the Antarctic Peninsula and a reversal in fortunes among penguin species there. Those broader trends provide context, but they do not show that every chinstrap population is changing at the same rate. 2
Where the world’s largest colony is now
The title has passed to the Adélie penguin colony at Cape Adare in the Ross Sea, more than 5,000 kilometres from Zavodovski. Its population was estimated at over one million birds in 2018. The comparison reflects the changing scale of the colonies; it does not mean that researchers counted both locations in the same year or by the same method. 12
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Zavodovski’s decline is a clear warning about the vulnerability of a major breeding colony. The survey establishes the scale of the change; continued monitoring will be important for tracking what happens next and testing the proposed links to food-web change.
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Zavodovski’s chinstrap population fell from about 1.09 million breeding birds in 2011 to 402,000 in 2025, and occupied nests declined 63%.
Sources
newser.comAn 'Enormous Crash' at World's Largest Penguin Colony
cbsnews.comIconic penguin colony sees "population collapse" driven by climate change, study finds
edition.cnn.comThis island was home to the planet’s largest penguin colony. Here’s why it just lost that title | CNN
pollar.newsZavodovski Island loses title as largest penguin colony after...