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I know something you don't know -- and I will tell you!
Date:12/29/2011

gaboon vipers and one rhinoceros viper. "As these highly camouflaged snakes sit in one place for weeks, it pays for the chimp who discovers it to inform other community members about the danger", says Crockford.

The researchers have monitored the behavior of 33 different chimpanzees, who saw one of three snake models and found that alarm calls were produced more when the caller was with group members who had either not seen the snake or had not been present when alarm calls were emitted. "Chimpanzees really seem to take another's knowledge state into account and voluntarily produce a warning call to inform the others of a danger that they [the others] do not know about", says Roman Wittig of the Max Planck Institute for Evolutionary Anthropology and the University of St. Andrews. "In contrast, chimpanzees were less likely to inform audience members who already know about the danger."

This study shows that these are not only intentionally produced alert calls, but that they are produced more when the audience is ignorant of the danger. "It is as if the chimpanzees really understand that they know something the audience does not AND they understand that by producing a specific vocalization they can provide the audience with that information", concludes Wittig. Some scientists suggest that providing group members with missing information by means of communication is a crucial stage in the evolution of language: why inform audience members if you do not realize they need the information? Until now it was not clear at what point in hominoid or hominid evolution this stage evolved. It has been assumed that it was more likely to be during hominid evolution. This study suggests, however, that it was already present when our common ancestor split off from chimps 6 million years ago.


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Contact: Roman M. Wittig
wittig@eva.mpg.de
49-034-135-50204
Max-Planck-Gesellschaft
Source:Eurekalert  

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