The esophagus of a duck. Duck, geese order duck family duck subfamily waterfowl collectively, or true duck. The duck band is the location between the gizzard and the duck's esophagus, also commonly known as the duck's esophagus. Duck belt is the most essential part of the duck body, but also the most nutritious part, and they also contain a lot of meat protein and food fiber, to make the food taste more layered by the people's favorite.