Grooming directed to different body areas is likely to imply different costs and benefits for groomers and groomees. In this study, we investigated social influences on grooming topography in captive female mandrills (Mandrillus sphinx). Subordinate groomers preferred to direct grooming to "safe" areas (the back and rump) compared to dominant groomers, while subordinate groomees did not solicit preferentially grooming to safe areas. Groomers tended to initiate grooming episodes from safe areas, while groomees solicited the switch to unsafe areas. Our results highlight a previously unrecognized source of conflict between the partners of grooming, one of the most common cooperative interactions in animals.

中文翻译：

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山魈美容师和美容师之间的美容地形冲突

针对不同身体部位的美容可能意味着美容师和美容师的不同成本和收益。在这项研究中，我们调查了社会对圈养雌性山魈（Mandrillus sphinx）的梳理地形的影响。与主导美容师相比，下属美容师更喜欢将美容引导到“安全”区域（背部和臀部），而下属美容师不会优先向安全区域进行美容。美容师倾向于从安全区域开始梳理毛发，而美容师则要求切换到不安全区域。我们的结果突出了以前未被认识到的梳理伙伴之间冲突的根源，这是动物中最常见的合作互动之一。