Byrne, R. W. & Bates, L. A. Sociality, evolution and cognition. Curr. Biol. 17, R714–R723 (2007).
Google Scholar
Wittig, R. M. & Boesch, C. Food competition and linear dominance hierarchy among female chimpanzees of the Tai National Park. Int. J. Primatol. 24, 847–867 (2003).
Mitani, J. C. Male chimpanzees form enduring and equitable social bonds. Anim. Behav. 77, 633–640 (2009).
Van Hooff, J. A. & Van Schaik, C. P. Male bonds: Afilliative relationships among nonhuman primate males. Behaviour 130, 309–337 (1994).
Herbinger, I., Papworth, S., Boesch, C. & Zuberbühler, K. Vocal, gestural and locomotor responses of wild chimpanzees to familiar and unfamiliar intruders: A playback study. Anim. Behav. 78, 1389–1396 (2009).
Watts, D. P., Muller, M., Amsler, S. J., Mbabazi, G. & Mitani, J. C. Lethal intergroup aggression by chimpanzees in Kibale National Park, Uganda. Am. J. Primatol. Off. J. Am. Soc. Primatol. 68, 161–180 (2006).
Watts, D. & Mitani, J. Boundary patrols and intergroup encounters in wild chimpanzees. Behaviour 138, 299–327 (2001).
Silk, J. B. et al. Strong and consistent social bonds enhance the longevity of female baboons. Curr. Biol. 20, 1359–1361 (2010).
Google Scholar
Schülke, O., Bhagavatula, J., Vigilant, L. & Ostner, J. Social bonds enhance reproductive success in male macaques. Curr. Biol. 20, 2207–2210 (2010).
Google Scholar
Surbeck, M. et al. Males with a mother living in their group have higher paternity success in bonobos but not chimpanzees. Curr. Biol. 29, R354–R355 (2019).
Google Scholar
Aureli, F. & Schaffner, C. Relationship assessment through emotional mediation. Behaviour 139, 393–420 (2002).
Aureli, F. et al. Fission-fusion dynamics: New research frameworks. Curr. Anthropol. 49, 627–654 (2008).
Zuberbühler, K. Audience effects. Curr. Biol. 18, R189–R190 (2008).
Google Scholar
Wittig, R. M., Crockford, C., Langergraber, K. E. & Zuberbühler, K. Triadic social interactions operate across time: A field experiment with wild chimpanzees. Proc. R. Soc. B Biol. Sci. 281, 20133155 (2014).
Slocombe, K. E. & Zuberbühler, K. Chimpanzees modify recruitment screams as a function of audience composition. Proc. Natl. Acad. Sci. 104, 17228–17233 (2007).
Google Scholar
Crockford, C., Wittig, R. M., Mundry, R. & Zuberbühler, K. Wild chimpanzees inform ignorant group members of danger. Curr. Biol. 22, 142–146 (2012).
Google Scholar
Townsend, S. W. & Zuberbuhler, K. Audience effects in chimpanzee copulation calls. Commun. Integr. Biol. 2, 282–284 (2009).
Google Scholar
Laporte, M. N. & Zuberbühler, K. Vocal greeting behaviour in wild chimpanzee females. Anim. Behav. 80, 467–473 (2010).
Kreibig, S. D. Autonomic nervous system activity in emotion: A review. Biol. Psychol. 84, 394–421 (2010).
Google Scholar
Crockford, C. et al. Urinary oxytocin and social bonding in related and unrelated wild chimpanzees. Proc. R. Soc. B Biol. Sci. 280, 20122765 (2013).
Google Scholar
Samuni, L. et al. Oxytocin reactivity during intergroup conflict in wild chimpanzees. Proc. Natl. Acad. Sci. 114, 268–273 (2017).
Google Scholar
Crockford, C., Deschner, T., Ziegler, T. E. & Wittig, R. M. Endogenous peripheral oxytocin measures can give insight into the dynamics of social relationships: A review. Front. Behav. Neurosci. 8, 68 (2014).
Google Scholar
Harrap, M. J., Hempel de Ibarra, N., Whitney, H. M. & Rands, S. A. Reporting of thermography parameters in biology: A systematic review of thermal imaging literature. R. Soc. Open Sci. 5, 181281 (2018).
Google Scholar
Ioannou, S., Gallese, V. & Merla, A. Thermal infrared imaging in psychophysiology: Potentialities and limits. Psychophysiology 51, 951–963 (2014).
Google Scholar
Vianna, D. M. & Carrive, P. Changes in cutaneous and body temperature during and after conditioned fear to context in the rat. Eur. J. Neurosci. 21, 2505–2512 (2005).
Google Scholar
Dezecache, G., Zuberbühler, K., Davila-Ross, M. & Dahl, C. D. Skin temperature changes in wild chimpanzees upon hearing vocalizations of conspecifics. R. Soc. Open Sci. 4, 160816 (2017).
Google Scholar
Dezecache, G., Wilke, C., Richi, N., Neumann, C. & Zuberbühler, K. Skin temperature and reproductive condition in wild female chimpanzees. PeerJ 5, e4116 (2017).
Google Scholar
Dunbar, R. I. Functional significance of social grooming in primates. Folia Primatol. (Basel) 57, 121–131 (1991).
Bekoff, M. & Allen, C. The evolution of social play: Interdisciplinary analyses of cognitive processes. In The cognitive animal: empirical and theoretical perspectives on animal cognition (eds Bekoff, M. et al.) 429–435 (The MIT Press, 2002).
Muller, M. N. & Mitani, J. C. Conflict and cooperation in wild chimpanzees. Adv. Study Behav. 35, 275–331 (2005).
Slocombe, K. E. & Zuberbühler, K. Agonistic screams in wild chimpanzees (Pan troglodytes schweinfurthii) vary as a function of social role. J. Comp. Psychol. 119, 67 (2005).
Google Scholar
Hosaka, K. Intimidation display. In Mahale Chimpanzees: 50 Years of Research (eds Hosaka, K. et al.) 435–447 (Cambridge University Press, 2015).
Muller, M. N. & Wrangham, R. W. Dominance, aggression and testosterone in wild chimpanzees: A test of the ‘challenge hypothesis’. Anim. Behav. 67, 113–123 (2004).
Wrangham, R. W. The cost of sexual attraction in female Pan. In Behavioural Diversity in Chimpanzees and Bonobos (eds Boesch, C. et al.) 204-215 (Cambridge University Press, 2002).
Townsend, S. W., Slocombe, K. E., Thompson, M. E. & Zuberbühler, K. Female-led infanticide in wild chimpanzees. Curr. Biol. 17, R355–R356 (2007).
Google Scholar
Herborn, K. A. et al. Skin temperature reveals the intensity of acute stress. Physiol. Behav. 152, 225–230 (2015).
Google Scholar
Kuraoka, K. & Nakamura, K. The use of nasal skin temperature measurements in studying emotion in macaque monkeys. Physiol. Behav. 102, 347–355 (2011).
Google Scholar
Ermatinger, F. A., Brügger, R. K. & Burkart, J. M. The use of infrared thermography to investigate emotions in common marmosets. Physiol. Behav. 211, 112672 (2019).
Google Scholar
Manson, J. H. et al. Intergroup aggression in chimpanzees and humans [and comments and replies]. Curr. Anthropol. 32, 369–390 (1991).
Tamioso, P. R., Rucinque, D. S., Taconeli, C. A., da Silva, G. P. & Molento, C. F. M. Behavior and body surface temperature as welfare indicators in selected sheep regularly brushed by a familiar observer. J. Vet. Behav. 19, 27–34 (2017).
Grandi, L. C. & Heinzl, E. Data on thermal infrared imaging in laboratory non-human primates: Pleasant touch determines an increase in nasal skin temperature without affecting that of the eye lachrymal sites. Data Brief 9, 536–539 (2016).
Google Scholar
Brügger, R. K., Willems, E. P. & Burkart, J. M. Do marmosets understand others’ conversations? A thermography approach. Sci. Adv. 7, e8790 (2021).
Google Scholar
Salazar-López, E. et al. The mental and subjective skin: Emotion, empathy, feelings and thermography. Conscious. Cogn. 34, 149–162 (2015).
Google Scholar
Muller, M. N., Thompson, M. E. & Wrangham, R. W. Male chimpanzees prefer mating with old females. Curr. Biol. 16, 2234–2238 (2006).
Google Scholar
Watts, D. P. Coalitionary mate guarding by male chimpanzees at Ngogo, Kibale National Park, Uganda. Behav. Ecol. Sociobiol. 44, 43–55 (1998).
Heinrichs, M. & Domes, G. Neuropeptides and social behaviour: Effects of oxytocin and vasopressin in humans. Prog. Brain Res. 170, 337–350 (2008).
Google Scholar
Surbeck, M., Mundry, R. & Hohmann, G. Mothers matter! Maternal support, dominance status and mating success in male bonobos (Pan paniscus). Proc. R. Soc. B Biol. Sci. 278, 590–598 (2011).
Reddy, R. B. & Sandel, A. A. Social relationships between chimpanzee sons and mothers endure but change during adolescence and adulthood. Behav. Ecol. Sociobiol. 74, 1–14 (2020).
Kosonogov, V. et al. Facial thermal variations: A new marker of emotional arousal. PLoS One 12, e0183592 (2017).
Google Scholar
Stanley, R. O. & Burrows, G. D. Varieties and functions of human emotion. Emot. Work Theory Res. Appl. Manag. 3–19 (2001).
Fredrickson, B. L. The role of positive emotions in positive psychology: The broaden-and-build theory of positive emotions. Am. Psychol. 56, 218 (2001).
Google Scholar
Or, C. K. & Duffy, V. G. Development of a facial skin temperature-based methodology for non-intrusive mental workload measurement. Occup. Ergon. 7, 83–94 (2007).
Reynolds, V. The Chimpanzees of the Budongo Forest: Ecology, Behaviour and Conservation (OUP, 2005).
Steketee, J. Spectral emissivity of skin and pericardium. Phys. Med. Biol. 18, 686 (1973).
Google Scholar
Chotard, H., Ioannou, S. & Davila-Ross, M. Infrared thermal imaging: Positive and negative emotions modify the skin temperatures of monkey and ape faces. Am. J. Primatol. 80, e22863 (2018).
Google Scholar
Newton-Fisher, N. Association by male chimpanzees: A social tactic?. Behaviour 136, 705–730 (1999).
Kano, F., Hirata, S., Deschner, T., Behringer, V. & Call, J. Nasal temperature drop in response to a playback of conspecific fights in chimpanzees: A thermo-imaging study. Physiol. Behav. 155, 83–94 (2016).
Google Scholar
Hobaiter, C. & Byrne, R. W. The gestural repertoire of the wild chimpanzee. Anim. Cogn. 14, 745–767 (2011).
Google Scholar
Nishida, T., Kano, T., Goodall, J., McGrew, W. C. & Nakamura, M. Ethogram and ethnography of Mahale chimpanzees. Anthropol. Sci. 107, 141–188 (1999).
Muller, M.N. Agonistic relations among Kanyawara chimpanzees. In Behavioural Diversity in Chimpanzees and Bonobos (eds Boesch, C. et al.) 212–220 (Cambridge University Press, 2002).
Goodall, J. The Chimpanzees of Gombe: Patterns of Behavior (Harvard University Press, 1986).
Wallis, J. Chimpanzee genital swelling and its role in the pattern of sociosexual behavior. Am. J. Primatol. 28, 101–113 (1992).
Google Scholar
Davila-Ross, M., Allcock, B., Thomas, C. & Bard, K. A. Aping expressions? Chimpanzees produce distinct laugh types when responding to laughter of others. Emotion 11, 1013 (2011).
Google Scholar
Schel, A. M., Townsend, S. W., Machanda, Z., Zuberbühler, K. & Slocombe, K. E. Chimpanzee alarm call production meets key criteria for intentionality. PLoS One 8, e76674 (2013).
Google Scholar
Vardasca, R. The influence of angles and distance on assessing inner-canthi of the eye skin temperature. Thermol. Int. 27, 130–135 (2017).
Josse, J. & Husson, F. missMDA: A package for handling missing values in multivariate data analysis. J. Stat. Softw. 70, 1–31 (2016).
Neumann, C. et al. Assessing dominance hierarchies: Validation and advantages of progressive evaluation with Elo-rating. Anim. Behav. 82, 911–921 (2011).
Noë, R., de Waal, F. B. & van Hooff, J. A. Types of dominance in a chimpanzee colony. Folia Primatol. (Basel) 34, 90–110 (1980).
Maechler, M., Rousseeuw, P., Struyf, A., Hubert, M., Hornik, K. (2019). cluster: Cluster Analysis Basics and Extensions. R package version 2.1.0.
Barton, K. MuMIn: Multi-model inference, R package version 0.12. 0. Httpr-Forge R-Proj. Orgprojectsmumin (2020).
Zeileis, A. & Hothorn, T. Diagnostic checking in regression relationships. R News 2, 7–10 (2002).
Lüdecke, D., Ben-Shachar, M. S., Patil, I., Waggoner, P. & Makowski, D. Performance: An R package for assessment, comparison and testing of statistical models. J. Open Source Softw. 6, 3139 (2021).
Google Scholar
Bolker, B. M. et al. Generalized linear mixed models: A practical guide for ecology and evolution. Trends Ecol. Evol. 24, 127–135 (2009).
Bates, D., Maechler, M., Bolker, B. & Walker, S. Fitting linear mixed-effects models using lme4. J. Stat. Softw. 67, 1–48 (2015).
Fox, J. & Weisberg, S. An R Companion to Applied Regression (Sage, 2019).
Lenth, R. emmeans: Estimated Marginal Means, aka Least-Squares Means. R package version 1.5.4. (2021).
R Core Team. R: A language and environment for statistical computing. R Foundation for Statistical Computing. https://www.R-project.org/ (2017).
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