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From Apes To Birds, There Are 65 Animal Species That 'Laugh' (arstechnica.com) 34

An anonymous reader quotes a report from Ars Technica: Among humans, laughter can signify a lot of different things, from intimacy to discomfort. Among animals, however, laughter usually communicates something along the lines of "this is playtime -- I'm not actually going for your throat." According to new research from the University of California, Los Angeles, there are likely at least 65 different creatures, including humans, that make these vocalizations. They're most commonly found in primates, but they have also been noted in distant relatives like birds. It's not clear whether this is because laughter has arisen several times over the course of evolution or if it's more widespread and we just haven't noticed.

The list of "laughing" animals is mostly made up of primates, but there are a few other mammals on the list, such as the degu -- whose laugh is described as purring or grumbling -- and the killer whale. There are even three birds on the list, such as the kea parrot, which uses play vocalizations discovered in 2017. According to [Sasha Winkler, a PhD student in UCLA's anthropology department], there have been other surveys of the primates who laugh, but little work has been done outside that group. "To my knowledge, no one has gone through and tried to see a comprehensive look of all the vocalizations during play across all mammals, and we even found some birds," she said. Winkler told Ars that understanding animal laughter could help us understand the origins of human laughter. Laughter in humans plays several other functions beyond play, such as indicating membership in a group.
The findings appear in the journal Bioacoustics.
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From Apes To Birds, There Are 65 Animal Species That 'Laugh'

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