Black-headed Gull

Blue ring with a white four alpha-numeric code, starting letter "N" / number / number / letter "N".

note 1 : 

Yellow ring with a black four alpha code, starting letter 'A'.

note 1 : birds ringed in southern Lower Saxony and north North Rhine-Westphalia.

note 2 : 

Black ring with a white four alpha-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

Yellow ring with a black four alpha-numeric code, starting letter 'C'.

note 1 : up to 2014, a total of 50 rings were delivered since 2002.

note 2 :

Black ring with a white four alpha-numeric code, starting letter "G".

note 1 :

Black ring with a white three alpha-numeric code (first letter "X"/number/letter).

note 1 : used codes are X0A...X0Z, X1A...X1Z, ... X9A...X9Z.

note 2 : during Jan. '16 a botulism catastrophe occured in the north of Israel with some 700 dead BHG and over 70 were collected, treated, hopefully released ringed.

note 3 :

Yellow ring with a black four alpha-numeric code (starting letter 'W', followed by 3 alpha-numeric code).

note 1 : some of these codes may be used on Eurasian Mew Gull (Larus canus).

note 2 :

Red ring with a white two numeric code.

note 1 : old red rings are turning pink.

note 2: a "." sign is to be read within the codes.

note 2 : code used is number/number.

note 3 : all birds ringed during winter in city-parks.

note 4  : all rings have to be read from bottom to top.

Black ring with a white four alpha code, starting letter 'A'.

note 1 :  

White ring with a black four alpha-numeric code : starting letter 'K' followed by letter 'A' and two numbers.

note 1 :  birds are ringed in the Omsk Region.

note 2 :