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Cygnus
genus of Anatidae within Anseriformes

trivial name latin name name specimens
Knobbelzwaan
Cygnus olor 		Cygnus olor 4 4
Zwarte Zwaan
Cygnus atratus 		Cygnus atratus 2 2
Zwarthalszwaan
Cygnus melanocoryphus 		Cygnus melanocoryphus 1 1
Wilde Zwaan
Cygnus cygnus 		Cygnus cygnus 2 2

species comparison1)

1) According to Hartmann (2000a, 2000b and 2016)

Random specimens

Knobbelzwaan
Cygnus olor
Wilde Zwaan
Cygnus cygnus
Zwarthalszwaan
Cygnus melanocoryphus
Knobbelzwaan
Cygnus olor