title: Reciprocal altruism and the limits of correlational analysis.
authors.forename: R M
authors.initials: RM
authors.lastname: Seyfarth
mesh_terms: D000533:Altruism; D000818:Animals; D005260:Female; D006120:Grooming / Q000502:physiology*; D008960:Models, Psychological; D011323:Primates / Q000523:psychology*