Lesser Black-backed Gull

White ring with a red four alpha-numeric code.

note 1 : since 1999 ca. 25 chicks are ringed every year at the Ebro Delta, western Mediterranean.

note 2 : rings were provided by Norman van Swelm in 1996.

note 3 : 25 birds are ringed in Galicia, NW Spain at the Ria de Arousa and Malpica colonies.

Black ring with a yellow four alpha-numeric code.

note 1 : c-ring on left leg and metal ring on right leg.

note 2 : last position uses each letter of the alphabet and * = number 0-9.

note 3 : used codes are T*TR through to T*TZ ; T*UA through to T*UZ ;  T*VA through to T*VZ ; T*WA through to T*WZ ; T*XA through to T*XZ ; T*YA through to T*YZ ; T*ZA through to T*ZZ.

note 4 : birds are ringed on the Isle of Man, British Isles.

note 5 : birds are ringed in agreement with the project of David Sowter, so not the same codes are used.

note 6 : 

Black ring with a yellow -unknown- alpha-numeric code, starting letter 'S'.

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

Black ring with a white four alpha-numeric code, starting letter 'C'.

note 1 : up to 2014, a total of 802 rings were delivered 1997-2013.

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

note 3 :

Black ring with a white four alpha-numeric code, starting letter 'A' followed by letter, number, letter.

note 1 : during spring 2005, 6 immature and 26 adults were ringed on a Asturian dump (43°29’N;05°49’W), Spain. Birds do not carry a metal ring.

note 2 :

Black 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.

Black ring with a white four alpha-numeric code :
(starting letter 'F' and three numbers)
OR
(starting letter 'F' and two numbers and one letter).

note 1 : the colour ring is always on left tarsus, with a metal ring on the right tarsus.

note 2 : all birds are from RIAS, a Wildlife rehabilitation and investigation centre in the south of Portugal.

note 3 : this project is for Larus fuscus and Larus michahellis, Started in December 2010 and ended in 2019

note 4 : Codes used: F000-F999, F00A-F99A, F00B-F99B, F00C-F99C, F00D-F99D and F00E-F99E

note 5 :

Black ring with a white five alpha-numeric code, starting letter 'J'.

note 1 :
 

Black ring with a white four alpha-numeric code, starting letter 'J'. 

note 1 :

Black ring with a yellow four alpha-numeric code.

note 1 : this is Dave Sowter's project, hosted by Peter Rock.

note 2 :  a white single letter indicating the ringing site : R=Ribble , T=Tarnbrook , W=Walney.

note 3 :