Two juvenile kea tussle playing on the ground. Credit Raoul Schwing

Kea shriek triggers infectious play

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Cheeky behaviour is pretty standard for kea, but new research has found that a specific kea squawk provokes playfulness in a kind of emotional contagion previously only seen in mammals. The researchers had noticed that kea use a particular call when they’re playing, so they played this call back to kea in the wild and found that it made them play with other birds, and if they were alone the call often inspired kea to perform aerial acrobatics or play with objects. The researchers think this induced playfulness is similar to infectious laughter in humans.

Journal/conference: Current Biology

Organisation/s: University of Auckland, University of Canterbury, Messerli Research Institute, Austria

Funder: This research was funded by the Brian Mason Scientific and Technical Trust and by a University of Auckland Doctoral Scholarship.

Media Release

From: Cell Press

For this New Zealand parrot, 'laughter' is contagious

When people are feeling playful, they giggle and laugh, making others around them want to laugh and play too. Now, researchers reporting in Current Biology on March 20 have found that the particularly playful kea parrot from New Zealand has a "play call" with a similarly powerful influence. When other kea hear that call, it puts them into a playful mood.

The findings make kea the first known non-mammal to have such an "emotionally contagious" vocalization, the researchers say. Earlier studies had made similar findings for chimpanzees and rats.

"We were able to use a playback of these calls to show that it animates kea that were not playing to do so," says Raoul Schwing of the Messerli Research Institute in Austria. "The fact that at least some of these birds started playing spontaneously when no other birds had been playing suggests that, similar to human laughter, it had an emotional effect on the birds that heard it, putting them in a playful state."

Schwing and his colleagues got interested in this particular call after carefully analyzing the kea's full vocal repertoire. It was clear to them that the play call was used in connection with the birds' play behavior. That made them curious to know how kea in the wild would respond to the recorded calls.

To find out, the researchers played recordings of play calls to groups of wild kea for a period of five minutes. The researchers also played other kea calls and the calls of a South Island robin as controls. When the birds heard the play calls, it led them to play more and play longer in comparison to the other sounds.

"Upon hearing the play call, many birds did not join in play that was already underway, but instead started playing with other non-playing birds, or in the case of solitary play, with an object or by performing aerial acrobatics," the researchers write. "These instances suggest that kea weren't 'invited' to play, but this specific call induced playfulness, supporting the hypothesis that play vocalizations can act as a positive emotional contagion."

While it might be a bit anthropomorphic, they continue, the kea play calls can be compared to a form of infectious laughter. The researchers say that they now plan to explore the effects of play and play calls on kea social groups more generally.

For the rest of us, the findings come as an intriguing reminder: "If animals can laugh," Schwing says, "we are not so different from them."


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    Experimental period with the play call stimuli the perched adult male and female kea react to the playback of the play call by engaging in a tussle.
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