Can parrots make each other laugh?
A new study shows that a New Zealand parrot has a laugh-like call that inspires playful behavior in other parrots.
Kea parrots respond to play call.
If New Zealand kea ever start producing sitcoms, they鈥檇 probably be wise to include a laugh track.
A team of European scientists has found that a playful mood can spread between the mountain parrots much as it does between humans, according to a paper published Monday in Current Biology. Previously, scientists had only observed this social phenomenon in mammals.
, the world鈥檚 only alpine parrot is no slouch when it comes to play. Their insatiable curiosity compels them to and carry off anything that isn鈥檛 nailed down, much to the frustration of unsuspecting tourists.
It was just this kind of intriguing behavior that attracted the attention of a team of scientists from the University of Veterinary Medicine in Vienna, Austria. They wondered if the kea鈥檚 playful behavior could be elicited by the laughter-like calls the birds make while fooling around.
To test their hypothesis, they played their own hidden-camera prank on the avian tricksters. Taping wild kea behavior for 15 minutes at a time, the researchers played audio recordings (including a kea laugh, a regular kea call, a different bird call, a whistle, and a neutral digital tone) during the five-minute middle interval.
The high-pitched cackle of the kea warble hit the birds like the end-of-school-bell affects weary youngsters. Compared with the other sounds, the scientists observed individuals become dozens of times more likely to engage in 鈥減lay events鈥� such as . They tended to play each game as well.
Most intriguingly, the laugh track had a near-universal effect on the birds. 鈥�, including adult males and females,鈥� became more likely to frolic after hearing the recording, the team wrote in the paper.聽
While it鈥檚 impossible to know precisely what was going on inside the keas鈥� heads, the researchers emphasized the fact that this call seemed to be able to cause bouts of play to break out. Rather than joining birds already mid-game, the recording led kea to start new games together, or even alone.
鈥淭hese instances suggest that kea weren鈥檛 鈥榠nvited鈥� to play, but that this specific call induced playfulness, supporting the hypothesis that play vocalizations can act as a positive emotional contagion,鈥� they wrote.
In other words, their laughter is infectious. It鈥檚 a phenomenon familiar to anyone who鈥檚 noticed that comedy movies are funnier with friends, as well as stand-up comics who get to follow a riotous act. Scientists have seen similar behavior in mammals, but the study is a first for birds.
鈥淭he only other animals to show this and rats, both very or relatively close in evolutionary terms,鈥� lead author Raoul Schwing told New Scientist. 鈥淥ur finding further bridges the perceived gap between humans and animals, and shows that it also happens in birds, which are very distantly related.鈥�
The study continues the long tradition of showing us how much we have in common with other species. 鈥淚f animals can laugh,鈥� Dr. Schwing said to New Scientist, 鈥渨e are not so different from them.鈥�