TOEIC Question of the Day

Common ducks are about the same size as common fowls. As the duck in a state of nature lives much upon the water, its form is at nearly every point different from the typical form of the fowl. The duck is usually described as boat-shaped, but, while this is a good description, it would be more correct to say that a boat is duck-shaped. The duck was the natural model for the first builders of boats. The feet of a duck are webbed between the forward toes, which makes them more serviceable as paddles in swimming.

Adapted from Our Domestic Birds: Elementary Lesson in Aviculture by John H. Robinson (1913)

According to the passage, how are ducks and fowls similar?