Citation: Yamamoto S, Humle T, Tanaka M (2009) Correction: Chimpanzees Help Each Other upon Request. PLoS ONE 4(10): 10.1371/annotation/80db4649-46c1-40af-851b-f01968eec5d7. https://doi.org/10.1371/annotation/80db4649-46c1-40af-851b-f01968eec5d7
Published: October 27, 2009
Copyright: © 2009 . This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Competing interests: No competing interests declared.