Ducks

species: 
Common Shelduck
scientific name: 
Tadorna tadorna
notes: 

White and yellow rings with a two alpha code (2 letters on each ring).

note 1 :

colour-ring type: 
Legrings : combination of coded.
colour-ring code (of the c-ring): 
Two alpha code (2 letters).
countries where ringed: 
France.