Birds: Penguins Do the Wave to Keep Warm
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© 2011 National Geographic; video courtesy Daniel P. Zitterbart/Erlangen University
Penguins Do the Wave to Keep Warm
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.