Ask and you shall receive. Video from NewScientist.
The authors argues that these results further prove the evidence for altruistic behavior in chimpanzees without direct personal gain or immediate reciprocation. These results also highlight the importance of "request" as a cause for prosocial behavior in chimpanzees, between kins or non-kins and also interaction between dominant and non-dominant individuals.
When compared to humans, chimpanzees do not perform acts of voluntary altruism. Unlike humans, chimpanzees do not necessarily act altruistically by just observing another chimpanzee struggle to achieve its goal. Chimpanzees cannot accurately understand others' desires in the absence of communicative signals such as a request.
Further reading on NewScientist.
Reference:
Yamamoto, S. Humle, T. Masayuki, T. 2009. Chimpanzees Help Each Other upon Request. PLoS ONE 4(10): e7416. [doi:10.1371/journal.pone.0007416]
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