"Stone-grooming," or grooming with a stone, has been reported in Macaca fuscata. This report provides a descriptive account of a similar behavior displayed by a female mangabey Cercocebus atys. During a study of embracing behavior in sooty mangabeys, one adult female was observed to groom her infant with a stone. The grooming pattern involved short strokes and/or a circular motion over the area being groomed-the infant's eye region. Stone-grooming appears to be a distinct type of grooming although the function(s) of this behavior remains unclear. The use of a stone in grooming may represent a case of tool use.
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