Aythya

Trivial name	Latin name
Tufted duck	Aythya fuligula
Greater scaup	Aythya marila
Common pochard	Aythya ferina
Ferruginous Pochard	Aythya nyroca
Hardhead	Aythya australis

comparison of wing and tail configuration¹

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