The Common Goldeneye is a medium-sized diving duck known for its distinctive round head and bright yellow eye. Males have a striking black and white plumage, while females are mostly brown with a lighter face. These ducks are often found in freshwater lakes and rivers during the breeding season, primarily in North America and Europe. During winter, Common Goldeneyes migrate to coastal areas and estuaries, where they feed on aquatic invertebrates and small fish. They are known for their agile diving abilities, allowing them to forage underwater. Their unique courtship displays include head bobbing and synchronized swimming, making them a fascinating species to observe.