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Description: These data come from a prosocial choice task conducted on captive pinyon jays. Experiment 1 measured baseline preferences (i.e. without hormonal manipulation), and Experiment 2 involved administration of a high or low dose of mesotocin (the avian homolog of oxytocin) or a saline control. Pinyon jays are prosocial but not altruistic and mesotocin increases the proportion of prosocial choices (over control). Thus, while prior research showed mesotocin's role in avian social behavior, like mammalian oxytocin, mesotocin also influences avian prosocial behavior.