Genus Gavia is a group of aquatic birds known as loons or divers. This genus consists of five species and is considered the only genus in the family Gaviidae. These birds have a streamlined body, webbed feet, and a sharp pointed beak. Synonyms for the genus Gavia include diver, loon, waterbird, and aquatic bird. These birds are found in freshwater and coastal regions of North America, Eurasia, and the Arctic. They are known for their beautiful and haunting calls, which often echo across lakes and rivers. The Gaviidae family is closely related to other waterbird families, such as grebes and auks.