It looks like a slightly comical Mexican wave, but researchers think a bobbing display seen in black-tailed prairie dogs could prevent the rodents being eaten. These "jump-yips", as they are known, are initiated by one animal, and spread throughout the group. via Pocket http://www.bbc.co.uk/news/science-environment-25596027#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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