Ducks are also called ‘Waterfowl’ because they are normally found in places where there is water like ponds, streams and rivers. Ducks are related to Geese and Swans. Ducks are sometimes confused with several types of unrelated water birds with similar forms, such as loons (an aquatic bird found in many parts of North America and northern Europe) or grebes (freshwater diving birds) and coots (medium-sized water birds which are members of the Rail Bird family).