Finland.

Black ring with a white 4 alpha-numeric code, starting letter 'C').

note 1 : Cxxx or Cxxxx (where x is a number or letter).

note 2 : up to 2014, a total of 2780 rings delivered since 1997-2000.

note 3 :

White ring with black 4 alpha-numeric code (starting letter 'C').

note 1 :  Cxxx (where x is a number or letter).
note 2 : 10000 white rings were delivered 1993-2003.
note 3 : many rings have also small text MUS FINLAND or MUS Z FINLAND.
note 4 : recent years some small check marks were added in the code (spots, underlines). Please, report them also.
note 5 : a similar project exists on Lesser Balack-backed Gull. The LBBGull c-ringing-project has been very successful. In ten years we have got almost 70000 reads from 4000 individuals. Now about 8000 reads/1000 individuals are made yearly. Before read ringing there were only 2000 found (about 50 ones/year) from 50.000 metal ringed LBbGs. The population of nominate LBBG (L. fuscus fuscus) has been strongly decreasing in Finland. It crashed to half of the one of the 1970’s and the bird was taken to the Red Book of Finnish Birds.

Yellow ring with black 2 alpha-numeric code  (on one leg) and metal ring (on other leg).

note 1 : the 2 alpha-numeric code consists of 1 letter and 1 number.

note 2 : over 200 birds are ringed in Finland since 2006.

note 3 :

Yellow ring with black 4 alpha-numeric code, startuing letter 'C'.

note 1 : up to 2014, a total of 2702 rings were delivered since 1996-2007.

note 2 :

White ring with black 4 alpha-numeric code, stareting letter 'C'.

note 1 : up to 2014, a total of 492 rings were delivered 1993-2001.

note 2 :