Lesser Black-backed Gull

Orange ring with a black three alpha-numeric code, starting letter 'S'.

note 1 : different colours are used each year and are yellow, orange, brown and black.

Orange ring with a black four alpha-numeric code, starting letter 'T' and 3 numbers.

note 1 : used codes are : letter T and 3 numbers (001-999).

note 2 : birds are ringed on the local rubbish dump of Salamanca (W.Spain).

note 3 :

Orange 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.

Orange ring with a black 4 alpha-numeric code (on left tarsus)
[ letter, letter, number, T ] or [ letter, number, letter, T ] and metal ring (on right tarsus) with as scheme site identifier is T (for Thames) (as last letter).

note 1 : unused 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 :

Orange (tall) ring with a black four numeric code.

note 1: used numbers are from 0001 till 9999.

note 2: birds may be colour dyed with either Rhodamine (pink/red) or picric acrid (yellow) : these sightings should be sent to Andy Baxter at andy.baxter@fera.gsi.gov.uk

note 3 :

Orange ring with a 4 alpha-numeric code (last letter 'M' after a 'colon' (on left leg) and metal ring (on right leg).

note 1 : Manx RG use orange ring with a black code : nxx:M , where n=letter and x=number).

note 2 :

Yellow ring with a black four alpha-numeric code, starting letter 'C'.

note 1 : up to 2014, a total of 4356 rings were delivered since 1996-2011

note 2 : there can exist small check marks in the code (like dots between characters), inform them also.

note 3 :

Yellow ring with a black four alpha-numeric code, starting letter 'V, number/letter/letter.

note 1 : used codes are V0AA-V9ZZ from 1990 onwards.

note 2 :

Yellow ring with a black three alpha-numeric code.

note 1 : used codes are 1AG-XG during 2002-2003.

note 2: 186 birds were ringed by the Severn Estuary Gull Group.

Combination of a yellow ring (coded E) (on one leg) and a red ring (coded E and two numbers) (on the other leg).

note 1 :