Black-headed Gull

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

note 1 : used codes are : KAAA-KZZZ.

note 2 : 

White ring with a black five alpha-numeric code.

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

note 2 : used letters (after the E) are A, C, F H, J, K, L, N, P, R, S, T, U, V, X, Z.

note 3 : used series are EA00A until EZ99Z.

note 4 : 

Black ring with a white four numeric code (starting number "2").

note 1 : several ringers participate(d) on the project : for details and direct contact information for the project leader, please, click on the following link:

https://app.bto.org/static/files/euring/Black-headed_Gull_UK.pdf

note 2 : 

Dark-green with a white two numeric code (on left tarsus).

note 1 : used codes are AA-ZZ, A0-Z9, 0A-9Z and 00-99. 

note 2 : by somes codes is check mark between de code.

note 3: rings a lighter green, but has to be reported as dark-green. See photo. 

note 4: most birds ringed during winter in city-parks since 2025.

note 5 : 

Dark-green with a white two alpha-numeric code (on left tarsus).

note 1 : used codes are AA-ZZ, A0-Z9, 0A-9Z and 00-99. 

note 2 : by somes codes is check mark between de code.

note 3: rings a lighter green, but has to be reported as dark-green. See photo. 

note 4: most birds ringed during winter in city-parks since 2025.

note 5 : 

Dark-green with a white two alpha code (on left tarsus).

note 1 : used codes are AA-ZZ, A0-Z9, 0A-9Z and 00-99. 

note 2 : by somes codes is check mark between de code.

note 3: rings a lighter green, but has to be reported as dark-green. See photo. 

note 4: most birds ringed during winter in city-parks since 2025.

note 5 : 

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 :