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. 2012 May 9;7(5):e36802. doi: 10.1371/journal.pone.0036802

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Wei et al.

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 properly credited.

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Whiskers indicate the 95% confidence interval of the means; outliers are given as dots. The negative value of mean R indicates that males received more grooming from females than they gave in return (mean R ± SE = −0.27). Males received more grooming from females in the mating season (mean R ± SE = −0.32±0.01) than that in the non-mating season (mean R ± SE = −0.18±0.02).