This may underline some of the motivations for social interaction in humans: "Rodents have been shown to demonstrate empathy for cagemates (but not strangers) in pain" ^ Dale J. Langford, Sara E. Crager, Zarrar Shehzad, Shad B. Smith, Susana G. Sotocinal, Jeremy S. Levenstadt, Mona Lisa Chanda, Daniel J. Levitin, Jeffrey S. Mogil (June 30, 2006). "
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