Lesser Black-backed Gull

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

note 1 : up to 2014, a total of 3 rings were delivered since 1996-1998.

note 2 :

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

note 1 : up to 2014, a total fo 2912 rings were delivered since 2001-2012.

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

note 3 :

Orange ring with black five alpha-numeric code : starting letter 'C' and xxxx (where x is a number or letter).

note 1 :

Red ring with white five alpha-numeric code : starting letter 'C' and xxxx (where x is a number or letter).

note 1 :

White ring with black five alpha-numeric code : starting letter 'C' and xxxx (where x is a number or letter).

note 1 :

Yellow ring with black five alpha-numeric code,  starting letter 'C'.

note 1 : up to 2014, a total of 16 rings were delivered since 2009

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

note 3 :

White ring with black one alpha code followed by a '+' (on right tibia) and metal ring (on left tarsus).

note 1 :

Orange ring with a black four alpha-numeric code (on left leg) and metal ring (on right leg).

note 1 : used codes are : number / number / number / colon ':' / letter 'F' ... where the letter 'F' is the scheme identifier (F is Forth).

note 2 :
 

Dark-green legring with a four alpha code (starting letter "S").

note 1 : after the "S" a 'dot' is to be found followed by three letters.

note 2 : birds ringed (irrespective of sex and age) near Zaanstad, The Netherlands.

note 3 : steel ring on opposite tibia.

note 4 :

Black ring with a white four alpha-numeric code, starting letters 'KU' or 'KX'.

note 1 :