Lesser Black-backed Gull

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) in some urban areas like IJmuiden, Zaanstad and Den Helder, all in 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 :  

Red ring with a white five alpha-numeric code, starting letter "KJ".

note 1 :

Dark-green ring with a white three alpha-numeric code : starting letter 'C' followed by ':' and two numbers (on right tarsus) and metal ring (on left tarsus).

note 1 : used codes are : C:01 -C:99,

note 2 :   

Brown (umber) ring with a white two alpha code.

note 1 : used codes are with a ":" or a "+" between the two letters.

note 2 :

Violet/mauve ring with a white two alpha code.

note 1 : used codes are with a ":" or a "+" between the two letters.

note 2 :

Dark-green ring with a white two alpha code.

note 1 : used codes are with a ":" or a "+" between the two letters.

note 2 :

White ring with a black four alpha-numeric code : number / number / letter 'Y' / number (on left leg) and metal ring (on right leg).

note 1 : used codes 00Y0 - 99Y9.

note 2 :

Yellow ring with a black three alpha-numeric code :
number / number / ":" (colon) / letter "W"
OR
letter / number / ":" colon / letter "W"

note 1 : letter "W" is the scheme marker.

note 2 : used codes are : 1A:W, 1B:W ... 0Y:W, 0Z:W ... A1:W, A2:W ... Z9:W, Z0:W.

note 3 : c-ring on left tarsus and metal ring on right tarsus.

note 4 : also Herring Gull and Great Black-backed gull is is ringed. 

note 5 : birds ringed in Walney Island, Cumbria (93 LBbG and 65 HG), Copeland, Ireland (1 LBbG and 15 HG), Bowland, Lancashire (24 LBbG and 1 HG), Skokholm, Pembrokeshire (72 LBbG and 2 HG).

note 6 :