Rats are ticklish too.

PositionSCIENCE - Brief article

You may not think of rats as warm and cuddly, but it turns out they have at least one cute trait: They're ticklish, just like us. In a recent experiment in Berlin, Germany, rats sought out researchers' hands to get tickled and even emitted ultrasonic squeals of laughter while being tickled. Attaching electrodes to rats' brains, scientists precisely pinpointed a tickle center in a mammal brain for the first time. Why does that matter? Though tickling is a basic behavior in humans and some other...

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