Buchanan, T. W., S. L. Bagley, R. B. Stansfield, and S. D. Preston. 2012. The empathic, physiological resonance of stress. Social Neuroscience 7:191–201.

Burkett, J., et al. 2016. Oxytocin-dependent consolation behavior in rodents. Science 351:375–78.

Burrows, A. M., B. M. Waller, L. A. Parr, and C. J. Bonar. 2006. Muscles of facial expression in the chimpanzee (Pan troglodytes): Descriptive, comparative and phylogenetic contexts. Journal of Anatomy 208:153–67.

Calcutt, S. E., T. L. Rubin, J. Pokorny, and F. B. M. de Waal. 2017. Discrimination of emotional facial expressions by tufted capuchin monkeys (Sapajus apella). Journal of Comparative Psychology 131:40–49.

Call, J. 2004. Inferences about the location of food in the great apes. Journal of Comparative Psychology 118:232–41.

Campbell, M. W., and F. B. M. de Waal. 2011. Ingroup-outgroup bias in contagious yawning by chimpanzees supports link to empathy. PloS ONE 6: e18283.

Caruana, F., et al. 2011. Emotional and social behaviors elicited by electrical stimulation of the insula in the macaque monkey. Current Biology 21:195–99.

Chamberlain, D. B. 1991. Babies don’t feel pain: A century of denial in medicine. Lecture at the 2nd International Symposium on Circumcision, San Francisco, CA.

Chen, P. Z., R. L. Carrasco, and P. K. L. Ng. 2017. Mangrove crab uses victory display to “browbeat” losers from re– initiating a new fight. Ethology 123:981–88.

Chester, D. S., and C. N. DeWall. 2017. Combating the sting of rejection with the pleasure of revenge: A new look at how emotion shapes aggression. Journal of Personality and Social Psychology 112:413–30.