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Emperor penguins rely on the formation of ice floes around the Antarctic coastline in order to breed. These ice sheets provide easy access to the sea, so that the giant birds are able to find fish to eat while raising their young on dry land.However, rising temperatures mean that the extent of the ice floes which form each winter is shrinking, giving the penguins less room to breed. Exceptionally warm spells during the winters of 2011 and 2012 threatened to put the penguins under exceptional pressure, as the ice floes hardly formed at all.
migrate northward for the winter
Quotemigrate northward for the winterI thought the emperor penguins overwintered within the Antarctic continent, which would be more to the south?