In the following passage some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.
Swans are large waterbirds that (1)________ to the family Anatidae, which also includes ducks and geese. They (2) ________ for their beauty and grace and are often used as symbols of love, fidelity, and elegance. They are also famous for their (3) ________ features, such as their long necks, large wingspans, and striking white feathers. (4) ________, not all swan species are white; the Black Swan, (5) ________, has black feathers with a red bill. Swans are found on every continent and are known for their strong pair bonds. They mate for life and can live up to 20 years.
Select the most appropriate option to fill in blank number 4.