Why is your dog laughing?

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That's a little inconvenient when it comes to the family mutt, but it could pose a major problem for researches around the world.

The workhorse in scientific laboratories is the lowly rodent and it has helped illuminate everything from diseases to drugs to human emotions, but new research suggests scientists have not been getting the full story. It turns out that rats speak a language that, until now, was understood only by other rats.

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