The life-cycle of the Emperor Penguin, the tallest and heaviest of all living penguin species. Adults spend nine months of the year breeding and caring for the egg and chick, during which they must trek across 90 km (56 mi) of ice and go without eating for up to four months. This cycle was depicted in the popular film March of the Penguins.Image credit: Zina Deretsky, NSF
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