Though some people keep rats as pets they are mostly thought of as pests but oddly enough rats laugh/giggle when they are tickled and also do a little jump when they are particularly happy. The laugh/giggle isn't audible to human ears but can be picked up with microphones that record it at a lower register. Rats aren't the only animals that enjoy being tickled,most members of the ape family have a human like laugh when they are tickled,other animals enjoy tickling too but when it comes to humans a survey revealed only 5 out of 10 humans enjoyed being tickled. It makes animals seem even more human than humans when you think about it.
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