Herring Gull

White ring with a black four alpha-numeric code, starting letter "K" followed by number/number/letter.

note 1 :

Yellow ring with a black 4 alpha-numeric code, starting or ending letter "P".

note 1 : first letter “P:" followed by and three numbers or letters or a combination of them.

note 2 : three numbers or letters or a combination of them before last letter “:P".
Used codes are : 001:P ~~ 999:P, 000:P, then A01:P ~~ A99:P, A00:P, B01:P, etc.
Then 1A1:P, ~~ 0Z0:P, then 01A:P ~~ 00Z:P.

note 3 : NOT used letters : A, B, C, D, E, G, H, J, K, L, M, N, P, R, S, T, U, V, W, X, Y, Z (i.e. excluding E or F, I (i), O and Q).

note 4 :

Yellow ring with a black four alpha code.

note 1 : it is not possible to identify the ringed small chicks exactly, additional photos by observers are welcome. In most cases the gulls are Caspian Gulls or Herring Gulls, but note the existence of many hybrids. The participation of some Yellowlegged and Lesser Black-backed Gulls is also possible.

note 2 :

Black ring with a white four alpha-numeric code (on left tarsus) [number/number/number/ ":N"] and metal ring (on right tarsus).

note 1 : used codes are :001:N, 002:N ~~  999:N, 000:N.  

note 2 :

Black ring with a white four alpha code, starting letter "G", followed by a colon “:”

note 1 : the project runs in Gipuzkoa, Spain but also in Bizkaia.

note 2 :

White ring with a black 2 alpha code (on left tibia).

note 1 : all rings are of the same design, with the letter repeated round the ring, so that the letters read horizontally on a standing bird. See image LBbG.

note 2 : birds are ringed as breeding adults on Skomer Island, Wales, as part of long-term population monitoring dating back to the 1970s

note 3 : Only the 20 letters A, B, C , D, F, H, I, J, K, L, N, O, P, S, T, U, V, X, Y, Z are used, since the others are too large (W , M) or too likely to other letters (E, G, Q, R).

note 4 :

(pale) Blue ring with a white 2 alpha-numeric code (mainly on right tibia).

note 1 : rings are 1,8cm. in height and placed above the knee (on the tibia) for better observation results in the colony (high vegetation) and on rubbish-dumps.

note 2 : the position of the metal ring can be left tibia or left tarsus.

note 3 :

(pale) Blue ring ring with a 2 alpha-numeric code code.

note 1 : rings are placed above the knee (on the tibia) for better observation results in the colony (high vegetation) and on rubbish-dumps. All other colours (with vertical placed codes) above the knee are also part of this project.

note 2 : In some series  used dots (1.A), colons (1:A) or single or double bars (1|A or 1||A). Those additional marks are part of the code

note 3 : In some series is an additional plain marker present at the other tibia, this marker is part of the combination.

note 4: Same codes can be used by other large gull species. If you have doubts about the species and/or code, please note the age and position of all the rings, including the metal ring.

note 5: used letters/numers are : A, B, C, D, E, F, G, H, J, K, L, M, N, P, R, S, T, U, V, W, X, Y, Z, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, + and =. Only the letters I, O and Q are never used

note 6: In this project are also used a combination of two coloured rings with both one letter or number at each tibia.

note 7 : 

Yellow ring with a black four alpha-numeric code , starting letter "B" followed by a colon ":" and three numbers.

note 1 :

Yellow ring with a black code 5 alpha code (starting letter 'H') and metal ring (on other leg).

note 1 :