Lesser Black-backed Gull

White ring with a black four alpha-numeric code, starting letter 'R', followed by letter, number, letter OR number, letter, number. 

note 1 : do please pay attention to the colon “R:” as this is very important.

note 2 : the birds are ringed on the Nature Reserve of Lilleau Niges,  Re Island, Charente Maritime department, France.

Blue ring with a white three alpha-numeric code.

note 1 :  used codes on 70 birds in 1996 is 1AS-0KS.

note 2 : this project is running on the Scilly Islands, UK.

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.

Blue ring with a three numeric code.

note 1 : code could be in yellow or in orange.

Blue ring with a three alpha code.

note 1 : code could be in yellow or in orange.

Blue ring with a three alpha-numeric code (2 letters en 1 number).  

note 1 : code could be in yellow or in orange.

note 2 : used code is: HA0-HA9, HB0-HB9, HC0-HC9, AJA-

Blue ring with a white three alpha-numeric code, startign letter '1', followed by a letter and followed by 'F'.

note 1 :

Blue ring with a white three alpha-numeric code.

note 1 : used codes are 00F-99F.

note 2 :

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

note 1 : used codes for the pale-blue rings are : J020-J600, J701-J999, JF00-JF99, JH00-JH99, JJ00-JJ99, JK00-JK99, JL51-JL99+00.

Blue (dark) ring with a white four alpha-numeric code, starting letter 'J'.

note 1 : used letters for the dark-blue rings are: A, C, G, E, H, J, K, L, M, N, P, R, S, T, U, V, X, Y, Z.