Gaviidae is a family of aquatic birds commonly known as loons. These birds are characterized by their distinctive body shape, sharp bills, and excellent diving abilities. They are primarily found in North America and parts of Europe and Asia, often inhabiting freshwater lakes and coastal marine environments. Loons are known for their haunting calls, which can be heard echoing across the water. Loons are skilled hunters, feeding mainly on fish and invertebrates. They have specialized adaptations, such as webbed feet and streamlined bodies, that make them efficient swimmers. The family Gaviidae includes several species, such as the Common Loon and the Red-throated Loon, each with unique features and behaviors.