Black-headed Gull

Dark-green ring with white four alpha-numeric code (2 / number / letter / number) (on left leg) and metal ring (on right leg).

note 1 :

Yellow ring with a black four alpha code, starting letter "H".

note 1 :

White ring with 4 alpha code, starting letter 'E'.

note 1 :

Yellow ring with a black four alpha-numeric code.

note 1 : used codes are : E00A-E99A.

note 2 : Black-headed gulls, ringed as juveniles in the south of Luxembourg and the nearby border region in Germany.

note 3 :

Black ring with a white four alpha-numeric code, starting letter "N" followed by three numbers (N000-N999).

note 1 :

Black ring with a white four alpha-numeric code.

note 1 : used codes are :  K201 - K399.

note 2 :

Dark-green ring with a white four alpha-numeric code (starting letter "N" followed by 3 digits alpha-numeric).

note 1 : used letters are  : A, B, C, F, H, J, K, L, M, N, P, R, S, T, U, V, W and X.

note 2 : used numbers are 0-9.

note 3 : birds ringed since 2022.

note 4 :

White ring with a black five alpha-numeric code.

note 1 : starting letter "J" followed by a four OR five alpha-numeric code.

note 2 :

Yellow ring with black five alpha-numeric code, starting letter "S".

note 1 : after the letter can be letter or number.

note 2 : code to be read from bottom till top.

note 3 :

Blue ring with a white four alpha-numeric code : starting letter "T" followed by a white three alpha-numeric code.

note 1 :