Common Goldeneye (Bucephala clangula), Special Concern in Wisconsin, is a medium-sized diving duck with a chunky body and a large head. Males are white with a black back and greenish-black head with a white spot on each side of the face. Females have a light-brown head, a white belly, breast, and flanks, interfaced with a gray back, wings and tail. Both sexes have distinctive bright yellow to pale yellow eyes. This species is an uncommon breeder in Wisconsin that nests in cavities with most individuals seen here during migration or winter. During the breeding season, it is found near ponds, lakes, and rivers in woodland areas. Clutch size is 5 eggs that are incubated by the female for 28-32 days. The species is threatened by the impacts of pesticides, deforestation, and decreased water quality. The recommended avoidance period is April 10 - July 10.
