# Chinstrap penguin decline on Zavodovski Island > Developing situation record from CLSTR: https://clstr.news/situations/chinstrap-penguin-decline-on-zavodovski-island > Updated: 2026-10-21T16:55:14.000Z. Sources: 5. Developments: 2. The chinstrap penguin population on Zavodovski Island has undergone a significant collapse. Research from the British Antarctic Survey indicates that the number of breeding individuals fell from approximately 1.09 million in 2011 to 402,000 in 2025, representing a nearly 63% decline. Scientists attribute this decline to human-driven climate change affecting ocean food webs. Rising ocean temperatures have caused Antarctic krill, the primary food source for these penguins, to migrate further south into colder waters. The penguins face a dilemma as southward ice cover and a lack of suitable nesting islands prevent them from following their food source, leading to potential starvation or movement to unsuitable habitats. While chinstrap populations have plummeted, macaroni penguins on the same island have seen a population increase, likely due to a more varied diet including fish and other crustaceans. Researchers have ruled out volcanic activity or competition with humpback whales as causes for the chinstrap penguin decline. ## Timeline ### 2026-10-21: Chinstrap penguin population declines on Zavodovski Island Research from the British Antarctic Survey shows a 63% decline in chinstrap penguin nests on Zavodovski Island due to climate-driven shifts in krill availability. 2 sources. https://clstr.news/cluster/chinstrap-penguin-population-declines-on-zavodovski-island ### 2026-10-13: Zavodovski Island penguin colony suffers rapid population collapse The chinstrap penguin population on Zavodovski Island has collapsed by nearly 63% since 2011, losing its status as the world's largest colony due to climate-driven food web disruptions. 3 sources. https://clstr.news/cluster/zavodovski-island-penguin-colony-suffers-rapid-population-collapse --- Cite as: Chinstrap penguin decline on Zavodovski Island. CLSTR, https://clstr.news/situations/chinstrap-penguin-decline-on-zavodovski-island