“That list includes a variety of primates, domestic cows and dogs, foxes, seals, and mongooses, as well as three bird species, including parakeets and Australian magpies.”
They tickle them, of course, as you can see in the video just above.
Laughter, on the other hand, seems somewhat better understood, even among species separated from us by tens of millions of years of evolution.
In their recent article, UCLA primatologist Sasha Winkler and UCLA professor of communication Greg Bryant describe how “play vocalizations” signal non-aggression during roughhousing.
When we laugh, we are often providing information to others that we are having fun and also inviting others to join.
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