The art of nodding off appears to have been mastered by breeding chinstrap penguins, who take more than 10,000 naps a day, with each nap lasting an average of four seconds, according to a new study.

Penguins are champion power nappers. Over the course of a single day, they fall asleep thousands of times, each bout a few seconds long, a new study has found.

The amazing thing about filming penguins in the wild, “Secrets of the Penguins” cinematographer Bertie Gregory tells Variety, is that since the big birds don’t have land-based predators ...

A new study reveals chinstrap penguins, who live in a noisy environment, fall asleep thousands of times in one day — for a few seconds each time. They need to be alert for predators.

He describes the penguins' lives as "an emotional rollercoaster," filled with challenges, resilience and untold secrets. "Secrets of the Penguins" premieres April 20 at 8/7c on National Geographic.