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Aythya
genus of Anatidae within Anseriformes

trivial name latin name name specimens
Tufted duck
Aythya fuligula 		Aythya fuligula 9 9
Greater scaup
Aythya marila 		Aythya marila 24 24
Common pochard
Aythya ferina 		Aythya ferina 4 4
Ferruginous Pochard
Aythya nyroca 		Aythya nyroca 4 4
Hardhead
Aythya australis 		Aythya australis 1 1

species comparison1)

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

Random specimens

Common pochard
Aythya ferina
Ferruginous Pochard
Aythya nyroca
Tufted duck
Aythya fuligula
Greater scaup
Aythya marila
Ferruginous Pochard
Aythya nyroca
Greater scaup
Aythya marila
Greater scaup
Aythya marila
Common pochard
Aythya ferina