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(a) Crossed-arms mutual grooming in gelada baboons: two animals lock wrists together and groom each other's upper arm or armpit. This form of distinctive of mutual grooming is common in gelada and has been reported in chimpanzees [67]. I have not observed it in the field in Papio, Colobus or Chlorocebus monkeys. (b) A grooming chain involving a gelada harem male and his three females. Photos, Robin Dunbar.
