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These two males were grooming each other for at least half an hour after lunch. Well, small gifts maintain friendship. The ceremony of cleaning each other’s fur from ticks and other irritating things, and showing mutual affection, strengthens the bonds between them. Our guide mentioned that these two guys were close friends, i.e. were frequently seen grooming each other. It didn’t seem to bother the one doing the belly scratching that the other was farting all the time, even while he was so close to the muzzle. Many group members were very flatulent and seemed to be used to the occasional breeze coming their way.
I put some more chimp pictures — also of the chimp baby and its mother — in the Africa gallery.