There is a white ball in the duck gizzard. According to relevant data, white balls belong to lymphocytes, and duck gizzards refer to duck gizzards. Duck gizzard is duck stomach, duck gizzard and duck muscle stomach. They are flat and round in shape, dense in meat, tough and chewy, and have a long taste without greasy feeling. They are delicious food and treasures for all ages. The main nutrients of duck gizzards are carbohydrates, protein, fat, nicotinic acid, vitamins and minerals such as calcium and magnesium.