The white-billed marsh bird is a species of bird known as the COOT (4 letters). It is a member of the rail family and is found in wetlands across North America, Europe, and Asia. It has a white bill and dark plumage, and is usually seen swimming or walking on the surface of the water. The COOT is an omnivore, feeding on aquatic plants, insects, and small fish. It is also known for its loud call, which can be heard from a distance.