Black-headed Gull

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

note 1 : used codes are : TTA1-TTA0 ; TTC1-TTC0 ; TTE  ... TUY0 ; and continuing ...

note 2 :

Yellow ring with a black four alpha-numeric code, starting letter 'T'.

note 1 :

Yellow ring with a black four alpha-numeric code (starting 2, then 'xxn'' where 'x' is a letter and 'n' a number.

note 1 : used codes are : 2AA0-2AY9 , 2BA0-2BY9 , 2CA0-2CY9 , 2EA0-2EY9 ,

note 2 :

Dark-blue ring with a white four alpha code : starting letter 'R'.

note 1 : not used letters are : D, G, M, O, Q, W, Y, and Z.

note 2 :

Dark-green ring with a white four alpha-numeric code, starting letter "J".

note 1 :

Red 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

Orange ring with a black 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 : first letter 'P' followed by a letter and two numbers.

note 1 : used codes are PAxx-PAxx, PCxx, PExx till PZxx (where x = number) and PA01...PA99, ... , PZ00-PZ99.

note 2 : project has been started in commemoration for Vytautas Pareigis, who sadly passed away early april 2013 when reading gull rings.

note 3 : 

Red ring with a white four alpha code (first letter H).

note 1 : used codes are Hlll, but also Hnnl and Hnll, where n=number and l=letter.

note 2 :

White ring with black five alpha-numeric code (starting letter "A") and metal ring (on other leg).

note 1 : rings are to be read from bottom to top.

note 2 : codes AB000-AB199 are used in Belarus. Only adult birds.

note 3 : the combination with a 5 alpha-numerics are used to test.
ex. AF123, AF366, ...

note 4 : codes like AX475, AT003, AD703 are used 2016 - 2020.

note 5 :