This viral video of penguins shuffling their way across the ice shows that even with webbed feet winter travel is tricky. The penguins waddle along quietly until one of then suddenly slips on the ice and upends itself.
The other penguins make a high pitched sound as they watch their friend fall over, as if to say "ouch." Or maybe they're saying "Ha-ha!"
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The video has been viewed more than a million times on YouTube.