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
Bird reserve Habitat) is an international agreement to protect wetlands, with special focus on aquatic birds. In Sweden it is the County administrative boards of Sweden and the Environmental Protection Agency that selects which areas are to be designated as bird reserves. Among the noted areas are Tåkern, Lake Hornborga, the southern part of Öland and Getterön. There are approximately 50 Ramsar areas in Sweden, and around 530 SPA areas where the latter comprises almost . Bird reserve A bird reserve (also called ornithological reserve) is a wildlife refuge designed to protect bird species. Like other wildlife refuges, the main goal of