G. E. Rice and P. Gainer, “‘Altruism’ in the Albino Rat,” J Comp and Physiological Psych 55 (1962): 123; J. S. Mogil, “The Surprising Empathic Abilities of Rodents,” TICS 16 (2012): 143; I. Ben-Ami Bartal et al., “Empathy and Pro-social Behavior in Rats,” Sci 334 (2011): 1427– 30.