How do penguins sleep?
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How do penguins sleep?

Different species of penguin sleep at different times and in different ways. Most penguins only take short naps. However, a few species (such as the Fairy penguins) come ashore every night and sleep for a few hours in their burrows. The other penguins spend most of their time at sea (some live at sea for more than 9 months of the year never coming ashore) and must sleep at sea - but no-one has been able to observe this behaviour yet.