Dunnock two or three adjacent female territories overlap one male territory, and so polygyny is favored, with the male monopolising several females. Polygynandry also exists, in which two males jointly defend a territory containing several females. Polyandry, though, is the most common mating system of dunnocks found in nature. Depending on the population, males generally have the best reproductive success in polygynous populations, while females have the advantage during polyandry. Studies have illustrated the fluidity of dunnock mating systems. When given food in abundance, female territory size is reduced drastically. Consequently, males can more easily monopolise the females. Thus, the mating
International Bird Rescue International Bird Rescue Research Center, the organization cares for an estimated 5,000 birds annually at two rehabilitation centers, the Los Angeles Oiled Bird Care and Education Center and the San Francisco Bay Oiled Wildlife Care and Education Center, that also serve as primary care facilities for oiled birds in the event of a spill in California. Common bird species treated include brown pelicans, common murres, western grebes, pacific loons, and a variety of gulls, herons, and other waterfowl. International Bird Rescue is a member of the Oiled Wildlife Care Network (OWCN), which is managed by the UC Davis School of