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The Trumpeter Swan (Cygnus buccinator) is the largest waterfowl species in North America and the largest swan in the world. It has a wingspan of 7-8 ft and can weigh between 21-30 lbs, although males are often heavier. Its long neck and strong feet enable it to uproot plants in water up to four feet deep. The term for a male is 'cob', whilst the female is known as a 'pen'. Adults are pure white with broad, black, flat bills. Their beaks have thin, salmon-red stripes along the bottom of the lower bill, which have fine tooth-like serrations along the edges, helping strain their diet of aquatic plants and water.