The monogamy is a system of matching which binds(connects) a single female to a single male. This monogamy can be defined as social and genetic (beyond the observation of the couple, the descent only arises from this couple, no partner's change appears), or as social and not genetic (in this case, infidelities or divorces can be observed). This system of matching is very rare in the animal kingdom. He(it) concerns less than 1 % of animals and major part of the studies on monogamy was realized on vertebrates (in particular on the birds among which 90 % of the sorts(species) present this monogamous system). Rarer are studies carried out on invertebrates (some cases of monogamy studied to shellfish, insects). Nevertheless the study of the monogamy
