Earth News

Related BBC sites

Page last updated at 10:17 GMT, Wednesday, 20 January 2010
Bornean orangutan acts as 'peacemaker' in Japan zoo
By Matt Walker
Editor, Earth News


Gypsy intervenes to make peace between Kiki and Chappy (video courtesy of Tama Zoological Park and Springer Japan)

A captive Bornean orangutan has been seen acting as a peacemaker, breaking up fights between other warring apes.

It is the first time that an orangutan has been seen behaving in this way, say scientists who published details in the journal Primates.

Peacemakers likely intervene in squabbles to ensure they do not spiral out of control.

That in turn stops violence affecting other apes in the group and helps the animals live harmoniously together.

Wild orangutans usually prefer to lead relatively solitary lives.

Orangutans can actively preserve peace in a captive group
Dr Tomoyuki Tajima
Kyoto University

"Orangutans spend most of their time alone in the wild," says Dr Tomoyuki Tajima of Kyoto University in Japan, who recorded the behaviour along with colleague Mr Hidetoshi Kurotori, a keeper at the Tama Zoological Park in Tokyo.

"However, they sometimes come and travel together, so researchers regard them as semi-solitary."

Yet in captivity, orangutans socially interact far more often, sometimes becoming aggressive toward one other.

So Tajima is studying how the apes cope with this novel situation.

He was surprised by what he found.

Bornean orangutan

"Orangutans can actively preserve peace in a captive group," he told BBC News.

That conclusion stems from observing five orangutans, comprising two adults, two juveniles and an infant, housed at the Tama Zoological Park.

During this time, one of the juveniles, a six-year-old female named Kiki, was introduced to the group.

Over 13 days of observations, another much older female called Chappy, thought to be 34 years old, became repeatedly aggressive toward Kiki, either chasing or physically attacking her on 28 separate occasions.

During 19 of these interactions, another orangutan intervened, physically stepping between the two squabbling apes to separate them.

Most of the time the peacemaker was an elder female orangutan called Gypsy, who is thought to be 51 years old.

However, a young juvenile male called Poppy also stepped in to quell the trouble.

On every occasion bar one, the peacemaking orangutan was not attacked by Chappy, the aggressor.

Similar peacemaking behaviour has been seen in gorillas and chimpanzees, but these are natural group-living apes, say the researchers.

For orangutans to mediate in this way shows just how flexible they are in adapting to new environments, says Dr Tajima.

Print Sponsor

Orangutan takes her own photos
20 Dec 09 |  Science & Environment
Gibbon 'dating agency' saves apes
09 Dec 09 |  Earth News
Orangutan ruse misleads predators
05 Aug 09 |  Science & Environment
Chimps born to appreciate music
30 Jul 09 |  Earth News
Gibbon sings 'door-slamming' tune
15 Jul 09 |  Earth News
Chimps mentally map fruit trees
08 Jun 09 |  Earth News
Orangutans cannibalise own babies
21 May 09 |  Earth News
Gorilla mums keep family in check
08 May 09 |  Earth News
Tickling a baby orangutan
04 Jun 09 |  Science & Environment



From Science/Environment in the past week

Americas Africa Europe Middle East South Asia Asia Pacific