Peaceful Meaning for the Silent Bared-Teeth Displays of Mandrills

  title={Peaceful Meaning for the Silent Bared-Teeth Displays of Mandrills},
  author={Nicolas Bout and B. Thierry},
  journal={International Journal of Primatology},
  • N. Bout, B. Thierry
  • Published 1 December 2005
  • Psychology
  • International Journal of Primatology
We studied the meaning of silent bared-teeth displays in a captive group of mandrills (Mandrillus sphinx). We observed the displays mostly in positive interactions, in which case they could advertise the sender's peaceful intentions, though at times they also occurred as a response to aggression. We found no relationship between the direction of agonistic interactions and the display. Both variants of the display, with closed or open jaws, exhibited mostly symmetrical patterns. The evolutionary… Expand

Figures from this paper

The Repertoire and Social Function of Facial Displays in Cebus capucinus
Systematic studies on facial displays in capuchins are limited and based mainly on studies of tufted capuchins (Cebus apella). Despite the great social-morphological variability within CebusExpand
Let's call a Truce...for now: The silent bared-teeth face expression in Mandrills (Mandrillus sphinx) during baseline and post-conflict conditions
The distinction between signals that are friendly and those that are non-aggressive but motivationally neutral (signals of benign intent, SBIs) has not often been well elucidated in the literature.Expand
Facial Displays in Young Tufted Capuchin Monkeys (Cebus apella): Appearance, Meaning, Context and Target
Infants perform most facial displays in the same contexts as adults, with the exception of the silent bared-teeth display that young capuchins use primarily, or exclusively, in affiliative contexts. Expand
The Complexity and Phylogenetic Continuity of Laughter and Smiles in Hominids
The present work provides an evolutionary reconstruction of the evolution of human laughter and smiles of positive affect in form and function, based on the principle of maximum parsimony. Expand
The use of the bared-teeth display during play fighting in Tonkean macaques (Macaca tonkeana): sometimes it is all about oneself.
Open mouths co-occurring with the bared-teeth display in Tonkean macaques were used to assess the context in which facial gestures only relevant for signaling are used during play, and support the possibility that play signals may sometimes be emitted not to communicate with the partner but with the performer itself. Expand
The Mandrill: A Case of Extreme Sexual Selection
Bringing to life, through detailed descriptions and rich illustrations, the mandrill’s communicatory biology and the functions of its brightly coloured adornments, this book sheds new light on the evolutionary biology of this fascinating primate. Expand
Social functions of relaxed open-mouth display in golden snub-nosed monkeys (Rhinopithecus roxellana)
It is suggested that relaxed open-mouth display serves important functions regarding submission, reconciliation, affiliation and reassurance in coordinating social interactions within OMUs in golden snub-nosed monkeys. Expand
Monitoring the social behavior of a bachelor mandrill (Mandrillus sphinx) dyad participating in touchscreen-mediated cognitive testing.
The observed positive changes in affiliative behavior suggest cognitive testing was enriching for the mandrills and participating in testing improved their welfare, and zoo beginning cognitive studies should monitor participant behavior to ensure their welfare is not compromised and is, ideally, enhanced. Expand
Know your enemy: accessibility and danger modulate the use of conciliatory patterns in mandrills
Although variations in the rate of reconciliation have been the subject of extensive studies, variations in conciliatory patterns and their differential use have barely been investigated. In thisExpand
The structural and motivational role of the unique lip-flip movement in the gelada (Theropithecus gelada) facial display repertoire.
The role of the lip-flip relative to the bared-teeth display is investigated to understand its role in generating communicative complexity and adaptations to increase facial mobility in gelada via facilitating thelip-Flip may promote increased communicative complex through increased conspicuousness and motivational signaling specification or intensification. Expand


Affiliative function of the silent bared-teeth display in moor macaques (Macaca maurus): Further evidence for the particular status of sulawesi macaques
The silent bared-teeth display is described in a captive group of Moor macaques and does not appear to convey specific information about the social status of partners and should be viewed as a signal advertising the emitter's peaceful intentions. Expand
Individual and social behavior in a captive troop of mandrills (mandrillus sphinx)
Little is known about the behavior of mandrills in the wild, and few captive studies have been conducted. Individual and social behaviors of six captive mandrills were categorized and quantified. TheExpand
Structural convergence between silent bared-teeth display and relaxed open-mouth display in the Tonkean macaque (Macaca tonkeana).
Comparaison de deux attitudes faciales chez H. Tonkeane en fonction de leur contexte d'emission. Une des attitudes consiste pour le singe a montrer les dents avec les machoires serrees sans emissionExpand
The formal hierarchy of rhesus macaques: An investigation of the bared‐teeth display
Teeth‐baring in a large captive rhesus monkey group (Macaca mulatta) was observed over a 30‐month period, indicating that dominance processes may be indistinguishable from social integration. Expand
Les rôles des colorations du Mandrill (Mandrillus sphinx)
It appears that the various coloured body parts fulfil different functions, although the same pigments occur throughout: the posterior colouration of the leader has a signal function for the troup, the penial colouration has a dominance function, and the facial colourations have evolved through rivalry of adult ♂♂ for ♀♀ and food. Expand
Hordes of mandrills (Mandrillus sphinx): extreme group size and seasonal male presence
It is postulated that the extreme coloration of males and strong sexual dimorphism in mandrills may have evolved through an enhanced need for competitive signals in a situation where no long-term social bonds between breeding partners exist. Expand
Facial Expression in Primates With Remarks On a Parallel Development in Certain Carnivores (a Preliminary Report On Work in Progress)
In this report of an unfinished study of the evolution of facial expressions the author draws a brief comparison between the most important facial muscles of various primates and of two carnivores,Expand
Preliminary report on the grouping of mandrills (Mandrillus sphinx) in Cameroon
A field study of mandrill was carried out from 1979 to 1983 in Cameroon for 27 months. Group size of mandrills ranged from 15 to 95 and composition was estimated by direct and indirect observations.Expand
Developmental variables and dominance rank in adolescent male mandrills (Mandrillus sphinx)
Adolescent males that were dominant for their age had higher testosterone levels, larger testes, and more advanced secondary sexual development than subordinate males. Expand