Black-headed Gull

Black ring with a white four alpha-numeric code, starting letter "K" followed by three numbers.
note 1 : used codes are : K001-...

note 2 :

Blue ring with a white three alpha code.

note 1 :

White ring with a black four alpha-numeric code, starting letter 'B' followed by three numbers.

note 1 : used codes are : B001 - B999.

note 2 : 45 (2015), 0 (2016), 40 (2017), 79 (2018), 38 (2019), 53 (2020), 39 (2021), 47 (2022) and 45 (2023) chicks were ringed at Lake Ptuj, Drava River, NE Slovenia, in a mixed gull and tern colony (46°24'21.31"N, 15°53'11.40"E).

note 3 : till April 2024, 181 resighting of 65 different birds abroad and 672 local resighting of 159 different birds (mostly around/in colony) were reported. 

note 4 : letter 'B' is in the lowest position (reading upwards) on the right leg, metal ring on the left leg.

note 5 : c-rings are used exclusively for ringing chicks with full-grown feathers.

note 6 :

Yellow ring with a black four alpha-numeric code (first letter H and three alpha-numerics). 

note 1 : project starts during 2019.

note 2 :  

Black ring with a white two numeric code (on left tarsus).

note 1 : between the code is a "-".

note 2 :  

Black ring with a white two alpha code (on left tarsus).

note 1 : between the code is a "-".

note 2 :  

Black ring with a white two alpha-numeric code (on left tarsus).

note 1 : between the code is a "-".

note 2 : 

Blue ring with a white four alpha-numeric code, starting letter "K followed by three numbers (on one leg) and metal ring (on other leg).

note 1 : adult and juvenile birds are ringed.

​note 2 :

Yellow ring with black four alpha-numeric code, starting letter 'E' and letter/number/number. 
also used : letter E + letter + letter + letter (EAAA-EZZZ).

note 1 : used codes are EA00-EZ99.

note 2 : used letters are A, E, H, J, K, L, M, N, P, R, S, T, U, V, X, Y.

note 3 : the project concerns breeding birds and pulli from a Belgian colony : for the 4 alpha-code >2500 birds ringed (dd. 04.2017) of which 1 hybrid ridibundus x melanochepalus and >3000 resightings.

note 4 : 

Black ring with a white four alpha code :
* first letter "G"/letter/letter/letter

note 1 : used codes are : GAAA till GZZZ.

note 2 :