Grooming behavior between mother and baby can strengthen the relationship between them. This study was also supported by [22, 25] which states that the mother of long-tailed macaques always groom their baby until they leave the group. The long-tailed macaques at the study area are also found to do grooming in different age groups which the young will groom the adult. This may be due to the hierarchy factor where the higher long-tailed macaques get more grooming than the lower hierarchy. This study was supported by [11] where higher ranking adult females of long-tailed macaques received more grooming by the other subordinate females.