Male Sturnus unicolor individuals face a choice when it comes to the mating season. They can either invest in parental care, through helping feed the young, provide shelter, etc. and be monogynous or they can control many nests at one time, increase the number of matings they engage in and be polygynous.
Male Sturnus unicolor birds face a decision during mating season: they can dedicate themselves to raising young by providing care and forming monogamous pairs, or they can spread their efforts across multiple nests, increasing their mating opportunities and becoming polygamous.