Ducks

species: 
White-headed Duck
scientific name: 
Oxyura leucocephala
notes: 

1 white ring with a black 2 alpha-numeric code.

note 1 :

email sighting submit: 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
White [W]
colour-ring code (of the c-ring): 
Two alpha-numeric code (2 letters/numbers).
countries where ringed: 
Spain.