People's behaviour in groups is fascinating and frequently disturbing.

人们在群体中的行为总是引人入胜而又时常令人烦恼。

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In the answer to this seemingly mundane question may lie an important truth about our behaviour in groups.

对这些看似平淡无奇的问题的回答，可能揭示一个人们在团队中行为的重要真理。

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Perhaps it's not surprising people in these groups radically change their behaviour, preferring members of their own group over others in many ways.

或许属于这种群体中的人们彻底地改变自己的行为，并在很多方面袒护同胞就显得并不足为奇。

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The researchers recorded GHC behaviour in four social groups of semi-wild chimpanzees living in the Chimfunshi Wildlife Orphanage Trust (CWOT) in the north west of Zambia.

BBC: Chimpanzee grooming is a 'postcode lottery'

Of the four groups studied, two engaged in GHC behaviour - one had a preference for wrist-to-wrist GHC whilst the other preferred palm-to-palm.

BBC: Chimpanzee grooming is a 'postcode lottery'

To survive and attract more help from the outside, the rebel groups need not only to rein in such behaviour but also to hone their military and political skills, says Emile Hokayem, a Bahrain-based analyst with the International Institute for Strategic Studies.

ECONOMIST: Rebel forces