Lesser Black-backed Gull

Blue ring with a white four alpha-numeric code :
*number/number/number/colon ":"/letter R.
OR
*number/number/letter/colon ":"/letter R.

note 1 : used codes are 000:R till 999:R OR 01A:R till 99Z:R, 00Z:R.

note 2 : 

Black ring with a white four alpha-numeric code : number/number/number/colon ":"/ letter C (on left tarsus) and metal ring (on right tarsus).

note 1 : used codes are 000:C till 999:C ; 00A:C till 99Z:C ;

note 2 : birds ringed on islands in Roaringwater Bay, Cork, Ireland on behalf of Cape Clear Bird Observatory.

note 3 : 

Blue ring with a white four alpha-numeric code, starting letter 'M' followed by a colon (:) and three numbers.

note 1 : M:001 till M:999.

note 2 : 

(Dark) green ring with a white four alpha-numeric code, starting letter "V:"

note 1 :

Red ring with a white four alpha-numeric code :
- number / number / number / ":"/ letter 'D' (on  left tarsus).
- letter / number / number / ":"/ letter 'D' (on  left tarsus).
- number / letter / number / ":"/ letter 'D' (on  left tarsus).

note 1 : some 200 birds HG/LBbG/GBbG are ringed in Dublin during 2017.

note 2 : 

Combination of :
​*red ring with a white one alpha code (letter 'K') (on left tarsus) and metal ring (on left tibia).
​* three c-rings (on right tarsus).

note 1 : this is an UvA-bits project used on the the local breeding population of Schiermonnikoog, NL in order to measure their space use in relation to a new-to-build off-shore wind farm within the foraging area of these birds. 

note 2 : used colourss as c-ring : red, yellow, dark-green, blakc and pale-blue.

note 3 :   

Dark-green ring with a white four alpha-numeric code, starting letter "N:" followed by number/number/letter or number/letter/number or letter/number/number (on left tarsus) and metal ring (on right tarsus).   

note 1 : used letters are A, B, C, D, E, G, J, K, L, M, P, R, S, T, U, V, W and Y.

note 2 : not used letters are : F, H, I, N, O, Q, X and Z.

note 3 : the letter is the scheme identifier, so : N:11A, N:21A...N:99A, N:00A...N:11Y... N99Y, N:00Y or N:A11…N:Y99, or N:1A1….N:9Y9.

note 4 :

Orange ring with a black four alpha-numeric code : xxx and letter 'H', where x can be a letter or a number.

note 1 :

White wingtag with a black three alpha-numeric code.

note 1 : used codes are : letter "E" followed by a letter and a number.

note 2 : 

Black ring with a white four alpha-numeric code, starting letter "X".

note 1 :