National Geographic News
Adobe Flash Player This video requires the latest version of Flash Player. Click here to download.

Published June 15, 2011

New, sped-up video of an emperor penguin huddle in Antarctica shows the group takes small steps, creating a wave. Researchers say the undulations ensure each penguin a turn in the middle of the cluster, which helps the birds keep warm.

© 2011 National Geographic; video courtesy Daniel P. Zitterbart/Erlangen University

RELATED LINKS

Pictures: Rare Penguins Blackened by Remote Oil Spill

Emperor Penguin Facts, Pictures, and More

UNEDITED TRANSCRIPT

When the temperature is as cold as minus 50 degrees Fahrenheit, it helps if there’s a warm body nearby.

Emperor penguins in the Antarctic are known to huddle together for warmth. But what we didn’t realize was that they were creating a ‘wave’ when new penguins joined the huddle, and that wave helped move the huddle en masse.

Physicist Daniel Zitterbart from the University of Erlangen-Nuremberg in Germany recorded high-resolution time-lapse images of the huddle near the Neumayer Antarctic Research Station. They were then speeded up to see what was happening.

As penguins move in, generally from the rear, penguins in the huddle make small steps in a formation, to help the tightly formed mass remain intact.

Zitterbart and his colleagues point out that it is crucial that the huddle is continually reorganized to give each penguin a chance to spend sufficient time inside the huddle, compared to time on the periphery.

The ‘wave’ is created by the small steps, estimated at just 2 to 4 inches. The researchers suggest those steps serve three purposes: first, to keep the pack as dense as possible; second, it leads to forward motion of the entire huddle; and thirdly, over time, leads to its reorganization. Separate smaller huddles can also merge into larger clusters.

The Emperor penguins in these videos are all male. And most carried an egg on his feet. The females had not yet returned to the colony.

The study was published in the online scientific journal PLoS ONE.


0 comments

Share

Featured Articles

Latest From Nat Geo

See more photo galleries »

The Future of Food Series

  • Download: Free iPad App

    Download: Free iPad App

    We've made our magazine's best stories about the future of food available in a free iPad app.

  • Why Food Matters

    Why Food Matters

    How do we feed nine billion people by 2050, and how do we do so sustainably?

See more food news, photos, and videos »