The guinea baboon doing the grooming here is Odo. We don't usually name animals other than chimps unless there is a very distinguishing feature that would make it easy to identify and match them in other videos. In this case, Odo has a very damaged right hand. It has only one finger, and the other fingers seem to be missing or fused. The handicap doesn't seem to interfere with this baboon's ability to meticulously groom. Original video:
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