Chad Clark's Open Journal : 2008-01-16
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January 16, 2008 :
1) Rats laugh when tickled.
http://www.freesciencelectures.com/video/rats-laugh-when-you-tickle-them/ reads:
Scientists listened to animals playing and they noticed something that
appeared to them to be laughter. They studied this behavior for couple of
years before [actually] realizing that it is laughter.
There is a you-tube video as well.
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