Osvath, M., and H. Osvath. 2008. Chimpanzee (Pan troglodytes) and orangutan (Pongo abelii) forethought: Self-control and pre-experience in the face of future tool use. Animal Cognition 11:661–74.
Panksepp, J. 1998. Affective Neuroscience: The Foundations of Human and Animal Emotions. New York: Oxford University Press.
–. 2005. Affective consciousness: Core emotional feelings in animals and humans. Consciousness and Cognition 14:30–80.
Panksepp, J., and Burgdorf, J. 2003. “Laughing” rats and the evolutionary antecedents of human joy? Physiology and Behavior 79:533–47.
Panoz-Brown, D., et al. 2018. Replay of episodic memories in the rat. Current Biology 28:1–7.
Parr, L. A. 2001. Cognitive and physiological markers of emotional awareness in chimpanzees (Pan troglodytes). Animal Cognition 4:223–29.
Parr, L. A., M. Cohen, and F. B. M. de Waal. 2005. Influence of social context on the use of blended and graded facial displays in chimpanzees. International Journal of Primatology 26:73–103.
Paukner, A., S. J. Suomi, E. Visalberghi, and P. F. Ferrari. 2009. Capuchin monkeys display affiliation toward humans who imitate them. Science 325:880–83.
Payne, K. 1998. Silent Thunder: In the Presence of Elephants. New York: Simon and Schuster.
Pepperberg, I. M. 2008. Alex and Me. New York: Collins.
Perry, S., et al. 2003. Social conventions in wild white-faced capuchin monkeys: Evidence for traditions in a neotropical primate. Current Anthropology 44:241–68.
Pinker, S. 2011. The Better Angels of Our Nature: Why Violence Has Declined. New York: Viking.
Pittman, J., and A. Piato. 2017. Developing zebrafish depression-related models. In The Rights and Wrongs of Zebrafish: Behavioral Phenotyping of Zebrafish, ed. A. V. Kalueff, 33–43. Cham: Springer.
Plotnik, J. M., and F. B. M. de Waal. 2014. Asian elephants (Elephas maximus) reassure others in distress. PeerJ 2: e278.
Plotnik, J. M., F. B. M. de Waal, and D. Reiss. 2006. Self-recognition in an Asian elephant. Proceedings of the National Academy of Sciences USA 103:17053–57.
Premack, D., and A. J. Premack. 1994. Levels of causal understanding in chimpanzees and children. Cognition 50:347–62.
Proctor, D., R. A. Williamson, F. B. M. de Waal, and S. F. Brosnan. 2013. Chimpanzees play the Ultimatum Game. Proceedings of the National Academy of Sciences USA 110:2070–75.
Proust, M. 1982. Remembrance of Things Past, 3 vols. New York: Vintage Press.
Provine, R. R. 2000. Laughter: A Scientific Investigation. New York: Viking.
Pruetz, J. D., et al. 2017. Intragroup lethal aggression in West African chimpanzees (Pan troglodytes verus): Inferred killing of a former alpha male at Fongoli, Senegal. International Journal of Primatology 38:31–57.
Range, F., L. Horn, Z. Viranyi, and L. Huber. 2008. The absence of reward induces inequity aversion in dogs. Proceedings of the National Academy of Sciences USA 106:340–45.
Rawls, J. 1972. A Theory of Justice. Oxford: Oxford University Press.
Rilling, J. K., et al. 2011. Differences between chimpanzees and bonobos in neural systems supporting social cognition. Social Cognitive and Affective Neuroscience 7:369–79.
Romero, T., M. A. Castellanos, and F. B. M. de Waal. 2010. Consolation as possible expression of sympathetic concern among chimpanzees. Proceedings of the National Academy of Sciences 107:12110–15.
Rowlands, M. 2009. The Philosopher and the Wolf: Lessons from the Wild on Love, Death and Happiness. New York: Pegasus.
Rozin, P., J. Haidt, and C. McCauley. 2000. Disgust. In Handbook of Emotions, ed. M. Lewis and S. M. Haviland-Jones, 637–53. New York: Guilford.
Sakai, T. et al. 2012. Fetal brain development in chimpanzees versus humans. Current Biology 22: R791 – R792.
Salovey, P., M. Kokkonen, P. N. Lopes, and J. D. Mayer. 2003. Emotional intelligence. In Feelings and Emotions: The Amsterdam Symposium, eds. T. Manstead, N. Frijda, and A. Fischer, 321–340. Cambridge: Cambridge University Press.
Sanfey, A. G., J. K. Rilling, J. A. Aronson, L. E. Nystrom, and J. D. Cohen. 2003. The neural basis of economic decision-making in the ultimatum game. Science 300:1755–58.
Sapolsky, R. M. 2017. Behave: The Biology of Humans at Our Best and Worst. New York: Penguin.
Sarabian, C., and A. J. J. MacIntosh. 2015. Hygienic tendencies correlate with low geohelminth infection in free-ranging macaques. Biology Letters 11:20150757.
Sarabian, C., R. Belais, and A. J. J. MacIntosh. 2018. Feeding decisions under contamination risk in bonobos. Philosophical Transactions of the Royal Society B 373.
Sato, N., L. Tan, K. Tate, and M. Okada. 2015. Rats demonstrate helping behavior toward a soaked conspecific. Animal Cognition 18:1039–47.
Sauter, D. A., O. LeGuen, and D. B. M. Haun. 2011. Categorical perception of emotional facial expressions does not require lexical categories. Emotion 11:1479–83.
Scheele, D., et al. 2012. Oxytocin modulates social distance between males and females. Journal of Neuroscience 32:16074–79.
Schilder, M. B. H., et al. 1984. A quantitative analysis of facial expression in the plains zebra. Zeitschrift für Tierpsychologie 66:11–32.
Schilthuizen, M. 2018. Darwin Comes to Town: How the Urban Jungle Drives Evolution. New York: Picador.
Schneiderman, I., et al. 2012. Oxytocin during the initial stages of romantic attachment: Relations to couples’ interactive reciprocity. Psychoneuroendocrinology 37:1277–85.
Schoeck, H. 1987. Envy: A Theory of Social Behaviour. Indianapolis: Liberty Fund.
Schwing, R., X. J. Nelson, A. Wein, and S. Parsons. 2017. Positive emotional contagion in a New Zealand parrot. Current Biology 27: R213 – R214.
Shapiro, J. A. 2011. Evolution: A View from the 21st Century. Upper Saddle River, NJ: FT Press Science.
Sherif, M., et al. 1954. Experimental study of positive and negative intergroup attitudes between experimentally produced groups: Robbers’ Cave Study. Norman: University of Oklahoma Press.
Sherman, R. 2017. Uneasy Street: The Anxieties of Affluence. Princeton, NJ: Princeton University Press.
Singer, T., B. Seymour, J. P. O’Doherty, K. E. Stephan, R. J. Dolan, and C. D. Frith. 2006. Empathic neural responses are modulated by the perceived fairness of others. Nature 439:466–69.
Skinner, B. F. 1965 [1953]. Science and Human Behavior. New York: Free Press.
Sliwa, J., and W. A. Freiwald. 2017. A dedicated network for social interaction processing in the primate brain. Science 356:745–49.
Smith, A. 1937 [orig. 1759]. A Theory of Moral Sentiments. New York: Modern Library.
–. 1982 [orig. 1776]. An Inquiry into the Nature and Causes of the Wealth of Nations. Indianapolis: Liberty Classics.
Smith, J. D., J. Schull, J. Strote, K. McGee, R. Egnor, and L. Erb. 1995. The uncertain response in the bottlenosed dolphin (Tursiops truncatus). Journal of Experimental Psychology: General 124:391–408.
Sneddon, L. U. 2003. Evidence for pain in fish: The use of morphine as an analgesic. Applied Animal Behaviour Science 83:153–62.
Sneddon, L. U., V. A. Braithwaite, and M. J. Gentle. 2003. Do fishes have nociceptors? Evidence for the evolution of a vertebrate sensory system. Proceedings of the Royal Society, London B 270:1115–21.
Springsteen, B. 2016. Born to Run. New York: Simon and Schuster.
Stanford, C. B. 2001. Significant Others: The Ape-Human Continuum and the Quest for Human Nature. New York: Basic Books.
Stomp, M., et al. 2018. An unexpected acoustic indicator of positive emotions in horses. PLoS ONE 13: e0197898.
Suchak, M., and F. B. M. de Waal. 2012. Monkeys benefit from reciprocity without the cognitive burden. Proceedings of the National Academy of Sciences USA 109:15191–96.
Tan, J., and B. Hare. 2013. Bonobos share with strangers. PloS ONE 8: e51922.
Tan, J., D. Ariely, and B. Hare. 2017. Bonobos respond prosocially toward members of other groups. Scientific Reports 7:14733.
Tangney, J., and R. Dearing. 2002. Shame and Guilt. New York: Guilford.
Teleki, G. 1973. Group response to the accidental death of a chimpanzee in Gombe National Park, Tanzania. Folia primatologica 20:81–94.
Tinklepaugh, O. L. 1928. An experimental study of representative factors in monkeys. Journal of Comparative Psychology 8:197–236.
Tokuyama, N., and T. Furuichi. 2017. Do friends help each other? Patterns of female coalition formation in wild bonobos at Wamba. Animal Behaviour 119:27–35.
Tolstoy, L. 1975 [orig. 1904]. The Lion and the Dog. Moscow: Progress Publishers.
Tottenham, N., et al. 2010. Prolonged institutional rearing is associated with atypically large amygdala volume and difficulties in emotion regulation. Developmental Science 13:46–61.
Tracy, J. 2016. Take Pride: Why the Deadliest Sin Holds the Secret to Human Success. New York: Houghton.
Tracy, J. L., and D. Matsumoto. 2008. The spontaneous expression of pride and shame: Evidence for biologically innate nonverbal displays. Proceedings of the National Academy of Sciences USA 105:11655–60.
Troje, N. F. 2002. Decomposing biological motion: A framework for analysis and synthesis of human gait patterns. Journal of Vision 2:371–87.
Tybur, J. M., D. Lieberman, and V. Griskevicius. 2009. Microbes, mating, and morality: Individual differences in three functional domains of disgust.