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Emperor Penguins in Warmer Antarctic Move to Ice Shelves to Breed

Some emperor penguins seem to be responding to a warmer Antarctic by moving onto ice shelves to raise their young. The large birds, which can weigh as much as 45 kilos, usually breed on floating sea ice, which gives them easy access to water where they hunt for food. Multi-year satellite observations of one particular colony revealed that the sea ice was dense enough during the winters of 2008 through 2010 for the colony to thrive. But the following year, and again in 2012, the ice did...

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