The Trumpeter Swan, Cygnus buccinator is the largest native North American bir, if measured in terms of weight and length, and is (on average) the largest waterfowl species on earth. Males typically measure from 145–163 cm (57–64 inches) and weigh 11.8 kg (26 lb); females typically range from 139–150 cm (55–60 inches) and weigh 10 kg (22 lb). It is rivaled in size among waterfowl only by the introduced Mute Swan, which is native to Eurasia, but the Trumpeter usually is longer-bodied. Exceptionally large male Trumpeters can reach a length of 183 cm (72 inches), a wingspan of 3 meters (almost 10 ft) and a weight of 17.4 kg (38 lb). The Trumpeter Swan is closely related to the Whooper Swan of Eurasia, and even has been considered the same species by some authorities.