White ring with black 4 alpha-numeric code (on tibia) : letter/number/number/number.
note 1 : used codes are Cxxx, A000 till Z000.
note 2 : birds are ringed in Spain during 2011.
note 3 :
Red ring with white 2 alpha-numeric code (letter/letter or number) (on tibia).
note 1 : birds ringed in Spain during 2010.
