ecofactbook
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species
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Animalia
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Chordata
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Aves
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Anseriformes
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Anatidae
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Cygnus
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Cygnus anatoides
Cygnus atratus
Cygnus bewickii
Cygnus buccinator
Cygnus columbianus
Cygnus cygnus
Cygnus mariae
Cygnus melancoryphus
Cygnus olor
Cygnus paloregonus
Cygnus unwini
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Cygnus anatoides