Goosander or Mergus merganser is a waterbird that primarily feeds on fish. It is commonly found in freshwater lakes, rivers, and streams. The goosander is also known as the common merganser, sawbill, sheldrake, fish duck, and harlequin merganser. These names are derived from their distinct saw-like beak, unique head pattern, and their feeding habits. The goosander is a popular game bird, and its meat is considered a delicacy in many parts of the world. The bird is known for its strong flight and diving abilities, making them an interesting sight for birdwatchers and nature lovers alike.