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The whooper swan (/ˈhuːpə(ɹ) swɒn/ "hooper swan"; Cygnus cygnus), also known as the common swan, is a large northern hemisphere swan. It is the Eurasian counterpart of the North American trumpeter swan , and the type species for the genus Cygnus .
Swans are the largest extant members of the waterfowl family Anatidae and are among the largest flying birds. The largest living species, including the mute swan, trumpeter swan, and whooper swan, can reach a length of over 1.5 m (59 in) and weigh over 15 kg (33 lb).
They regularly forage in close association with Bewick's and whooper swans, two species that trample underwater sediment to excavate food. Studies have shown that this behaviour greatly increases the food intake rate of the pochards, as they glean food items that drift away from where the swans are trampling.
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The trumpeter swan (Cygnus buccinator) is a species of swan found in North America.The heaviest living bird native to North America, it is also the largest extant species of waterfowl, with a wingspan of 185 to 304.8 cm (6 ft 2 in to 10 ft 2 in).
Rüppell's vultures, whooper swans, alpine chough, and common cranes all have flown more than 8 km (26,000 ft) above sea level. Adaptation to high altitude has fascinated ornithologists for decades, but only a small proportion of high-altitude species have been studied.
The mute swan is less vocal than the noisy whooper and tundra swans; they do, however, make a variety of sounds, often described as "grunting, hoarse whistling, and snorting noises." During a courtship display, mute swans utter a rhythmic song.
The Dalmatian pelican (Pelecanus crispus) is the largest member of the pelican family and perhaps the world's largest freshwater bird, although rivaled in weight and length by the largest swans. They are elegant soaring birds, with wingspans rivaling those of the great albatrosses, and their flocks fly in graceful synchrony.