Lesser Black-backed Gull

White ring with red 3 alpha-numeric code : number/letter/F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : about 200 birds ringed in 1998 and 2011.

note 3 : if middle letter  = A, B, C, D, E, H, J, K, L or M then birds ringed in 1998.

note 4 : if middle letter = N, P, S, T, U, V, W, X, Y or Z then birds ringed in 2011.

note 5 : number = 0 - 9.

note 6 : example codes are:  2AF, 6EF, 9MF, 2XF, 5ZF.

Brown ring with white 3 alpha-numeric code : number/letter/F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : about 100 birds ringed in 1997.

note 3 : middle letter  = A, B, C, D, E, H, J, K, L or M.

note 4 : number = 0 - 9.

note 5 : example codes are:  2AF, 6EF, 9MF.

Dark blue ring with white 3 alpha-numeric code, : number/letter/F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : about 200 birds ringed in 1996 and 2004.

note 3 : if middle letter  = A, B, C, D, E, H, J, K, L or M then birds ringed in 1996.

note 4 : if middle letter = N, P, S, T, U, V, W, X, Y or Z then birds ringed in 2004.

note 5 : number = 0 - 9.

note 6 : example codes are:  2AF, 6EF, 9MF, 2XF, 5ZF.

Grey ring with black 3 alpha-numeric code : number/letter/F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : about 100 birds ringed in 1995.

note 3 : middle letter  = A, B, C, D, E, H, J, K, L or M.

note 4 : number = 0 - 9.

note 5 : example codes are:  2AF, 6EF, 9MF.

Yellow ring with a single black letter F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : birds ringed in 1994.

Orange ring with a single black letter F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : birds ringed in 1993.

Dark blue ring with a single white letter F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : birds ringed in 1989.

White ring with a single black letter F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : birds ringed in 1991.

Dark green ring with a single black letter F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : birds ringed in 1990.

Red ring with a single white letter F.

note 1 : birds ringed at Flat Holm Island, Cardiff.

note 2 : birds ringed in 1989.