Yellow-legged Gull

White ring with a black four alpha-numeric code : starting letter 'N' followed by a colon (:) / letter "A" / number / letter

note 1 : used letters are  A, B, C, F, H, J, K, L, M, N, P, R, S, T, U, V, W and X.

note 2 : used numbers are 0-9.

note 3 : birds ringed since 2012.

note 4 : ex. : N:A3X, N:A0A, ...

Orange ring with a blue three alpha-numeric code : number-letter-number.

note 1 : used codes are number-letter-number. Starting from 1 to 8.

note 2 : the ring plate measures 65mm. x 35mm. and the code is 3x engraved.

note 3 : the project runs since 2003 and is coordinated by Gustavo Ballestros (ANSE, Murcia, SE Spain).

note 4 :

Dark-blue ring with a white four alpha-numeric code starting letter 'E' followed by three numbers.

note 1 :

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

note 1 : used codes : M:001...M:999.

note 2 : 

Yellow ring with a white four alpha-numeric code (starting letter 'H') (on one leg) and metal ring (on other leg). 

note 1 : rings are to be read from bottom to top, most rings have a “checkpoint”.

note 2 :  birds are ringed with combinations like H234, H4A4 etc.

Red ring with a white four alpha-numeric code (starting letter 'H') (on one leg) and metal ring (on other leg). 

note 1 : during 2010 the code HXxx was used, where x stands for alpha-numeric.

note 2 : rings are to be read from bottom to top, most rings have a “checkpoint”.

White ring with a black four alpha-numeric code : 
3 numbers followed by a colon (:) and ending letter "U") (on right tarsus) and metal ring (on left tarsus).

note 1 : used codes are 001:U - 999:U

note 2 : the ring 001:U incorrectly on the left tarsus!

note 3 : species are Larus cachinnans and Larus michahellis.

note 4 : birds are also ringing in mixed colonies. Chicks species identification is often impossible, so please digital photos are appreciated.

note 5 :

Orange ring with a black 4 alpha-numeric code  : 
* letter / letter/  number / letter 'T' (on left tarsus)
* metal ring (on right tarsus)
 

note 1 : used codes are the letters E, I, O and Q and additionally, to avoid the remote possibility of any confusion with YLG in Spain, codes will not start with the letter B.

note 2 : scheme site identifier is letter 'T' (for Thames) (as last letter).

White ring with a black four alpha-numeric code, starting letter 'Y' followed by ' : ' and three numbers.

note 1 : used codes are Y:001 - Y:999.

Red ring with a white four alpha-numeric code, starting letter 'U' (on right leg) and metal ring.

note 1 : starting letter 'U', followed by a number and two letters.

note 2 : this is the only species of which pulli are ringed.

note 3 :