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Have you tried napping with your eyes open? Chinstrap penguins have mastered the art! These sleep-deprived dads (and moms!) take thousands of 4-second naps a day to keep their chicks safe.

Nesting Chinstrap Penguins Take Over 10,000 Small Naps Throughout the Day, New Research Finds The penguins approached the stones and took care in choosing one they liked. Once they had a pebble ...