Lesser Black-backed Gull

White ring with a red three alpha-numeric code : one number and two letters.

note 1 : used codes are 1AH-9YH.

note 2 : 

White ring with a black three alpha-numeric code.

note 1 : starting letters are 'T' or 'BP' or S.

note 2 : 

White ring with a black four alpha-numeric code, starting letter 'C'.

note 1 : up to 2014, a total of 10286 rings were delivered since 1993-...

note 2 : there can exist small check marks in the code (like dots between characters), inform them also.

note 3 :

White ring with a black four alpha-numeric code, starting letter 'KJ' or 'KR' and two alpha-numerics. 

note 1 : 700 ringed in Russian Karelia during 2002-2008 ; some without  metal ring.

White ring witk a black four alpha-numeric code, starting letter 'M'.

note 1 : during the period 1995-2000 about 600 Lesser Black-backed Gulls (L.f.fuscus) were ringed.

note 2 :

White ring with a black four alpha-numeric code, starting letter 'A' followed 3 alpha-numerics.

note 1 : the metal BTO is fitted on the left leg.

note 2 : used codes are A1AA - A1ZZ black characters on white,  A2AA - A2ZZ black characters on white, A3AA - A3ZZ black characters on white, A4AA - A4ZZ black characters on white, A5AA - A5ZZ red characters on white, A6AA - A6zz black characters on white,  A7AA - A7ZZ black characters on white.

note 3 : codes will be used till A9**. The wild gull chicks have been ringed on roof nests along the south coast.

White ring with a black four alpha-numeric code :
* starting letter 'N' followed by a colon ":"
- followed by three numbers or three alpha-numerics. 
or
- followed by letter 'A' / number (4 or 5) / letter. 

note 1 : ex. : N:001-N:999 ; N:A4A ; N:A5X but also N:37X, ...

note 2 : 

White ring with a black four-alphanumeric code, starting letter 'N'.

note 1 : used codes are N500-N599.

note 2 : the project was running between 1995 and 2005, birds were ringed on a landfill site near Madrid and Badajoz.

White ring with a red six alpha-numeric code (Z, A or M and 4 alpha-numerics).

note 1 : used codes are ZA+4 digits for the Sisargas Islands (Malpica, A Coruña, Central Galica) and ZM+4 digits for the Sálvora Island (Ria de Arousa, South Galicia).

White ring with a black four alpha-numeric code.  

note 1 : used codes are N366 tot N399.

note 2 : birds are ringed during the winter at Tarragona Harbour.