females to integrate themselves into the adult social structure. This has been particularly well-documented in female-female interactions. Sub-adult females rarely groom each other, but rather focus their attention on grooming older females. These young females, who stay in their natal groups, must develop relationships with adult females to assimilate into the adult female social structure. In these instances, young females often seek out grooming opportunities with adult females. The adult females who are the recipients of this behavior are generally less enthusiastic about the interaction than their younger counterparts. This may indicate that adult females gain little benefit from these grooming interactions compared with sub-adult females. Sub-adult females may support their older companions in aggressive interactions. Young females that fail to establish relationships with older females become peripheral to the group and lose access to resources. Grooming behavior among adult females has a different pattern. Contrary to the normal pattern in primates, females often groom individuals who are lower in rank than they are. This may be largely due to the presence of two different grooming strategies among adult female wedge-capped capuchins. One of these strategies is referred to as appeasement. Subordinate females, when approached by dominant females, will lie down and solicit grooming. This has been interpreted as a way to avoid aggressive behavior from the dominant female. Interactions where a dominant female approaches a subordinate one often end in aggressive behavior, and soliciting grooming is a way to diffuse that aggression. This form of grooming is usually not reciprocated by the subordinate female. The other form of grooming behavior among adult females is affiliative. In contrast to grooming as appeasement, affiliative grooming is dependent on reciprocation. These interactions usually occur between individuals that hold high or intermediate positions in the dominance hierarchy. This form of grooming helps establish alliances between females that may provide both social and material advantages. Alloparenting Allomaternal care, where an individual other than an infant’s mother helps care for it, is common in wedge-capped capuchins. There are several behaviors associated with allomaternal care in these monkeys, including nursing and carrying the infant. For the first three months after birth, infants are cared for exclusively by their mothers. However, allomaternal care dramatically increases during the next three months of development to the point where infants generally receive less care from their mothers than from other females. Siblings provide far more care for infants than non-related