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This Concept Map, created with IHMC CmapTools, has information related to: mating systems Def AF Mech, "social polygyny" defined as 1 male mates with multiple females, 90% of "socially monogamous" songbirds "mess around" gaining EPCs = Extra-Pair Copulations, Red-necked Phalarope (shorebird) for which males incubate eggs & tend young, "sex-role reversal" because the roles of males vs. females is reversed, 1 female mates with multiple males exhibited by one human group: (some) Tibetan farmers, bothers share one wife (and the farm remains intact) driven by small farms (if split between brothers, neither farm could support a family), aditional protection, resources, improved learning as compared to "single-parental care", these birds are not "sexually monogamous", instead these birds are sexually polyandrous if females gain EPC with > 1 male, the selective advantage to the male are two-fold including insurance against loss of offsping because they are in more than1 nest, males incubate eggs & tend young called "sex-role reversal", two individuals who are sexually exclusive & when documented using genetic analysis, a form of relationship in which an individual has only one partner during any one time which can include Social Monogamy, 15% of primates including White-handed Gibbons, mammals driven partly by females exclusively feed offspring milk from their mammary glands, females exclusively feed offspring milk from their mammary glands so male parental care is not needed prior to weaning of young, considered rare in the animal kingdom in that 90% of "socially monogamous" songbirds "mess around", 15% of primates including Pygmy Marmosets, monogamy can be defined as a form of relationship in which an individual has only one partner during any one time, "social polyandry" defined as 1 female mates with multiple males, sexually polygyny (if males gain EPC) for which the selective advantage to the male are two-fold