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In social animals, including humans, social grooming is an activity in which individuals in a group clean or maintain one another's body or appearance. A related term, allogrooming, indicates social grooming between members of the same species. Grooming is a major social activity, and a means by which animals who live in proximity may bond and reinforce social structures, family links, and build relationships. Social grooming also is used as a form of reconciliation and a means of conflict resolution in some species. Mutual grooming typically describes the act of grooming between two individuals, often as a part of social grooming, pair bonding, or a precoital activity.

It is a reuse of ordinary grooming behavior, a means of achieving hygiene and good health, in that an animal helping another animal to clean itself also is helping to form a social bond and trust between them.

In non-human animals


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Animals regularly clean themselves to keep their fur, feathers, scales, or other skin coverings in good condition. This activity - known as personal grooming, preening, or auto-grooming - promotes hygiene. Dead skin and foreign objects such as insects, ectoparasites, and leaves, dirt and twigs, are some of the items typically removed.

Many social animals groom each other, an activity known as social grooming, mutual grooming, or allo-grooming. Items removed during social grooming are identical to those removed by personal grooming. Social grooming also takes the form of stroking, scratching, and massaging.

Primates provide perhaps the best example of this activity. The trust and bonding it builds is critical to group cooperation. Among primates, social grooming plays an important role in establishing and maintaining alliances and dominance hierarchies, for building coalitions, and for reconciliation after conflicts; it is also a resource that is exchanged for other resources, such as food and sex. Primates groom socially in moments of boredom as well, and the act has been shown to reduce tension and stress. It is often associated with observed periods of relaxed behaviour, and primates have been known to fall asleep while receiving grooming.

Results of research shows that male crab-eating macaques will groom females in order to get sex. One study found that a female has a greater likelihood to engage in sexual activity with a male if he had recently groomed her, compared to males who had not groomed her.

Vervet monkey siblings often have conflict over grooming allocation by their mother. Yet, grooming remains an activity that mediates tension and is low cost for alliance formation and maintenance.

Other animals groom socially as well. These include insects, birds, ungulates, and bats. An example of a bird that socially grooms is the Scaly-breasted Munia. Whereas social grooming among primates has been very well-studied, less is known about social grooming in these other animals.

Mammals often perform social grooming. Domesticated animals, especially cats and dogs, will groom trusted humans as a sign of affection.

In humans


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A few empirical studies of human social grooming exist. They rely on self-report survey and experimental methodology of adults, living primarily in the U.S. and other Western cultures. People report grooming romantic partners more than grooming people they have other types of relationships with such as family members, friends, and strangers. Grooming is associated with increased relationship satisfaction, trust, and experience of family affection while growing up. People who groom, as opposed to touching each other without grooming, are perceived to be better potential parents, more in love with the person they have groomed and more caring and committed to them. Women, but not men, tend to think people who have groomed one another are romantically involved. People also think that if people who have groomed one another are romantically involved, they are in a long-term relationship rather than one that has just begun. Human mutual grooming plays a role in pair-bonding, however, entire industries may be attributed to human social grooming, including hair care (e.g. beauty salons and barber shops) and personal clothes tailoring. There is also some aspect of social grooming in the medical fields of dentistry, dermatology, and plastic surgery. The exchange of resources is grooming or hygienic services for a fee.

Endocrine effects of grooming


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Grooming stimulates the release of beta-endorphin, which is one physiological reason for why grooming appears to be relaxing.

Additionally, an article published in 1997 concluded that an increase in maternal grooming resulted in a proportionate increase in Glucocorticoid receptors on target tissue in the neonatal rat. Additionally, it was found that the receptor number was altered because of a change in both serotonin and thyroid-stimulating hormone concentrations. An increase in the number of receptors might influence the amount of negative feedback on corticosteroid secretion and prevent the undesirable side effects of an abnormal physiologic stress response.

Role of special neurons


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A team of Caltech scientists showed that a particular type of neuron, identified by molecular markers, responds specifically to stroking.

See also


Cooperation between non-kin in animal societies : Article : Nature
  • Licking#In animals
  • Cleaner fish
  • Cleaning symbiosis
  • Community cohesion
  • Personal grooming
  • Social cohesion

References


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Further reading



  • Mooring, M. S. & Hart, B. L. (1997). Reciprocal allogrooming in wild impala lambs. Ethology, 103(8), 665-680.
  • Mooring, M. S. & Samuel, W. M. (1998). The biological basis of grooming in moose: Programmed versus stimulus-driven grooming" Animal Behaviour 56(6), 1561-1570.
  • Poulin, R., Bansemer, C., Grutter, A. S. (2002). Geographic variation in the behaviour of the cleaner fish Labroides dimidiatus (Labridae). Ethology, 108(4), 353-366.


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