Penguin populations have plummeted at a key breeding colony in Argentina, mirroring declines in many species of the marine flightless birds due to climate change, pollution and other factors, a study shows. Dee Boersma, a University of Washington professor who led the research, said the plight of the penguins is an indicator of big changes in the world’s oceans due to human activities. For the past 25 years, Boersma has tracked the world’s largest breeding colony of Magellanic penguins on Argentina’s Atlantic coast. Since 1987 she has observed a 22 percent decrease in the population of these penguins at the site. (Reuters)

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