Maintaining a massive huddle of thousands of penguins may sound simple, but sticking together in a pack so large turns out to be quite complicated.
via Discovery News http://news.discovery.com/animals/penguin-huddles-move-like-waves-131217.htm#mkcpgn=rssnws1
via Discovery News http://news.discovery.com/animals/penguin-huddles-move-like-waves-131217.htm#mkcpgn=rssnws1
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