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In page P. Dee Boersma:

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Boersma and a team of researchers banded more than 44,300 Magellanic penguin chicks at Punta Tombo from 1983 to 2010, finding 3,296 of those chicks made it back to the breeding colony where they were born. Overall, they found that fewer female penguins survived.[2][3] Her research in Argentina has demonstrated climate-induced change that forced penguins to swim about 25 miles farther each day in search of food, which reduced their chance of survival.[citation needed]