Bonobos say no by shaking their heads

May 7, 2010 by Lin Edwards, report
Bonobo. Photo taken by Kabir Bakie at the Cincinnati Zoo.

( -- Scientists report having observed and filmed bonobos (also known as pygmy chimpanzees) shaking their heads to say “no” to prevent an unwanted behavior in another animal. Bonobos have never before been observed using the gesture in this way.

The scientists, led by Christel Schneider of the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, filmed (Pan paniscus) in Leipzig Zoo shaking their heads from side to side with disapproval to prevent others doing something, such as a mother stopping her infant from climbing a tree or playing with food instead of eating it.

Bonobos and other great apes such as chimpanzees (Pan troglodytes) have previously been observed using head gestures in their communications. They shake their heads, bow, and nod, but until now shaking their heads from side to side has only been reported as being used to encourage other bonobos to play, and not as a gesture of disapproval. Ms Schneider and colleagues observed the behavior being used by four different bonobos on 13 separate occasions.

Chimpanzees and bonobos are our closest living relatives, and in many human cultures (but not all) shaking the head is also used to signal “no”. Schneider said she believes the behavior in the bonobos may represent an early precursor to negative head-shaking gestures in humans.

Ms Schneider said bonobos are known to use a greater variety of head gestures than chimpanzees, and said the greater sophistication in their communications may have developed because of the type of society bonobos live in, which is egalitarian with complex and a less pronounced hierarchy than in other groups. Shaking their heads to say no could avoid serious conflict.

Bonobos are an endangered species living in remote rainforest areas of the in central Africa. They are the least well-known of the great apes and were only identified in 1933. They stand more erect than the common chimpanzee and often walk bipedally.

The observations were made as part of a wider study of communication in the infants of great apes, including , bonobos, orangutans and gorillas, in several zoos across Europe. The researchers say more research is needed to be certain the gestures really do mean “no”, and to fully document the functions of all the head gestures made by the great apes.

The findings are published in the journal Primates.

Explore further: Developmental delay may explain behavior of easygoing ape species

More information: Christel Schneider et al., Do bonobos say NO by shaking their head? Primates, DOI:10.1007/s10329-010-0198-2

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5 / 5 (5) May 07, 2010
...or the bonobos adopted this behaviour from observering the researchers. While it's possible the bonobos spontaneously adopted this method of communication, the fact that it's a normal method of communication amongst humans makes me think that bonobos are just as intelligent to observe their observers.
not rated yet May 07, 2010
This is clearly the effect of the chimps observing the humans that come to watch them.

To further clarify this -- and I am not sure if it is true of this region -- but if there are gestures unique to that area that they also mimick then it would a conclusive arguement. The gesture of shaking your head for no is very common across most cultures and would be easily observable by anyone watching the apes -- but something unique to that area can only be picked out by someone not of the culture that is very fimiliar with the locals in the area.
5 / 5 (1) May 07, 2010
Haha, the Google-ad is "Bonobos: Better fitting mens pants"
5 / 5 (3) May 07, 2010
I thought bonobos were the apes that *couldn't* say no.
not rated yet May 07, 2010
I guess this adds new meaning to the name "bo NO bos"


sorry couldn't resist.
May 08, 2010
This comment has been removed by a moderator.
May 08, 2010
This comment has been removed by a moderator.
not rated yet May 08, 2010
The gesture of shaking your head for no is very common
-And probably came from the natural movement in response to someone offering you something smelly by shoving it in your face; the reflex to divert your nose and mouth to one side or the other. I noticed while in Crete the people there nodded up and down while saying no, which may mean 'with all due respect I humbly say no', or somesuch.
5 / 5 (1) May 08, 2010
We have livestock guardian and herding dogs. Highly intelligent and closer to their ancients in many ways. They too use these gestures to communicate as well as a lot of other language. Most people miss this. I work with the dogs so much that I learn their language as well as them learning the hand signs, whistles and spoken words I use to communicate to them. People think themselves too distinct from nature. The reality is a lot of this is deep language that goes far back.

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