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Star Trek's Tribbles are known for two distinctive sounds they make: a soothing coo/purr noise when they're petted, and a harsh, grinding shriek to express their dislike of Klingons. Have the cast or crew ever talked about where those sounds came from?

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My hairless Guinea pig makes the same sound a tribble makes when they are happy and calm. – user29421 Jan 2 at 13:51
up vote 8 down vote accepted

From the Memory Alpha article for the episode The Trouble with Tribbles:

Sound effects editor Douglas Grindstaff combined altered dove coos, screech owl cries and emptying balloons to create the tribble sounds.

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Wow. I came so close. I looked at the Memory Alpha article for Tribbles, but not the episode they appeared in! *sadface* – Mason Wheeler Mar 16 '13 at 5:20

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