In "The Ugly Duckling," a young bird is mistaken for a duck until it grows up to be a beautiful swan. A swan is a large bird with a long, elegant neck.

You're most likely to see swans in the water, but they also spend some time on land. Baby swans are called cygnets, and as adults, they're either cobs (if male), or pens (if female). If you're lucky enough to see a whole group of swans swimming or flying together, you can call it a bevy of swans. Swan comes from a root meaning "to sing."

Definitions of swan
  1. noun
    stately heavy-bodied aquatic bird with very long neck and usually white plumage as adult
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    large white South American bird intermediate in some respects between ducks and swans
    adult male swan
    female swan
    a young swan
    Cygnus olor, mute swan
    soundless Eurasian swan; commonly domesticated
    Cygnus cygnus, whooper, whooper swan
    common Old World swan noted for its whooping call
    Cygnus columbianus, tundra swan
    swan that nests in tundra regions of the New and Old Worlds
    Cygnus buccinator, trumpeter, trumpeter swan
    large pure white wild swan of western North America having a sonorous cry
    Cygnus atratus, black swan
    large Australian swan having black plumage and a red bill
    Cygnus columbianus columbianus, whistling swan
    North American subspecies of tundra swan having a soft whistling note
    Bewick's swan, Cygnus columbianus bewickii
    Eurasian subspecies of tundra swan; smaller than the whooper
    type of:
    aquatic bird
    wading and swimming and diving birds of either fresh or salt water
  2. verb
    sweep majestically
    “Airplanes were swanning over the mountains”
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    type of:
    sail, sweep
    move with sweeping, effortless, gliding motions
  3. verb
    move about aimlessly or without any destination
    synonyms: cast, drift, ramble, range, roam, roll, rove, stray, tramp, vagabond, wander
    drift, err, stray
    wander from a direct course or at random
    go via an indirect route or at no set pace
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    wander aimlessly
    gad, gallivant, jazz around
    wander aimlessly in search of pleasure
    type of:
    go, locomote, move, travel
    change location; move, travel, or proceed, also metaphorically
  4. verb
    declare or affirm solemnly and formally as true
    synonyms: affirm, assert, aver, avow, swear, verify
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    assert or affirm
    claim, take
    lay claim to; as of an idea
    authenticate; affirm to be true, genuine, or correct, as in an official capacity
    state firmly
    affirm or avow formally or solemnly
    assure, tell
    inform positively and with certainty and confidence
    type of:
    state emphatically and authoritatively
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