Give me the studies, so that I can read them for myself. Thanks.
Here are some studies and reported observations. Much more is available.
Hattori, Y., K. Leimgruber, K. Fujita, and F. B. M. de Waal. 2012. Food-related tolerance in capuchin monkeys (Cebus apella) varies with knowledge of the partner’s previous food-consumption. Behaviour 149:171–85.
Goodall, Jane 1986. The Chimpanzees of Gombe: Patterns of Behavior. Cambridge, MA: Belknap.
Siebenaler, J. B., and D. K. Caldwell. 1956. Cooperation among adult dolphins. Journal of Mammalogy 37:126–28.
de Waal, Frans.2008. Putting the altruism back into altruism: The evolution of empathy. Annual Review of Psychology 59:279–300.
de Waal, Frans. 2009a. The Age of Empathy: Nature’s Lessons for a Kinder Society. New York: Harmony.
Boyd, R. 2006. The puzzle of human sociality. Science 314:1555–56.
Langergraber, K. E., J. C. Mitani, and L. Vigilant. 2007. The limited impact of kinship on cooperation in wild chimpanzees. Proceedings of the Academy of Sciences USA 104:7786–90.
National Academies of Sciences and Engineering, Keck Futures Initiative Conference, Irvine, CA, November 2014.
Janmaat, K. R. L., L. Polansky, S. D. Ban, and C. Boesch. 2014. Wild chimpanzees plan their breakfast time, type, and location. Proceedings of the National Academy of Sciences USA 111:16343–48.
Tan, J., and B. Hare. 2013. Bonobos share with strangers. PloS ONE 8:e51922.
Horner, V., D. J. Carter, M. Suchak, and F. B. M. de Waal, 2011. Spontaneous prosocial choice by chimpanzees. Proceedings of the Academy of Sciences USA 108:13847–51.
Koski, Sonja E. E. H. M Sterck. 2009. Empathic chimpanzees: A proposal of the levels of emotional and cognitive processing in chimpanzee empathy. European Journal of Developmental Psychology. Vol 7:38-66.
De Waal, Frans. 2008. Putting the Altruism Back into Altruism: The Evolution of Empathy. Annual Review of Psychology. Vol. 59:279-300
Andrews K. 2012. Do Apes read minds? Toward a New Folk Psychology. Cambridge, MA: MIT press
Caruso, C. 2016. Chimps May Be Capable of Comprehending the Minds of Others. Scientific American