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Prairie dogs perform contagious Mexican wave
http://www.bbc.co.uk/news/science-environment-25596027
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.
In a study, scientists concluded that the animals use jump-yips to "test" the alertness of their neighbours.
Details appear in the Royal Society journal Proceedings B.
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