Yellow-eyed penguins have the most variable incubation period of any penguins, with eggs taking anywhere from 39 to 51 days to hatch. With the exception of emperor penguins, whose incubation period is two months, penguin eggs hatch in just over one month and, within any given species, this seldom varies by more than a day or two.
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Department of Conservation
Photograph by Greg Lind
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