Black-headed Gull

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

note 1 : used combinations 2012 till 2017 are : letter/number/number/number OR letter/letter/number/number OR letter/letter/letter/number OR letter/number/letter/letter OR letter/letter/number/letter ... as ex. A001, AC88, AAA4, AA5N, A3NV at Hamburg and Schleswig- Holstein / Germany. 

note 2 : 2016 and following years, codes with 5 characters like AF004, AX567 and AD770 are used.

note 3 : rings are to be read from bottom to top.

note 4 :  codes like AT000 – AT999 will be used 2017 and following years at Austria.

note 5 :  

White ring with a black 3 alpha code.

note 1 : used codes are YYY, etc...

note 2 : used codes LAA to LZZ are used by Frank Majoor : f.majoor5@upcmail.nl.

note 3 :

White ring with a black four alpha code (starting letter T).

note 1 : >1000 birds ringed since 2010.

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

note 3 : adult breeding birds and pulli arde ringed in colony at Przykona Reservoir (Central Poland, wielkopolskie region). Some birds I have ringed also in breeding colony at Rynskie Lake (NW Poland, warminsko-mazurskie region).

note 4 :

White ring with a black two numeric code (on left tarsus).

note 1 : code used are number/number (00-99).

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

note 2: old yellow rings are turning white, so beware !! But yellow rings are nearly all fallen off.

note 3: white rings from 2011 onwards.

note 4: all birds ringed during winter in city-parks.

note 5: all rings have to be read from bottom to top.
 

White ring with a black two alpha code (on left tarsus).

note 1 : used codes are letter/letter (AA-ZZ).

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

note 2: old yellow rings are turning white, so beware !! But yellow rings are nearly all fallen off.

note 3: white rings from 2011 onwards.

note 4: all birds ringed during winter in city-parks.

note 5: all rings have to be read from bottom to top.
 

Dark-blue ring with a white two numeric code (on left leg).

note 1 : code used is number/number (11-99).

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

note 3 : some 850 birds are ringed from 2000 until 2003. Most of these rings are fallen off.

note 4 : all birds ringed during winter in city-parks.

note 5 : all rings have to be read from bottom to top.

Dark-blue ring with a white two alpha code (on left leg).

note 1 : code used is letter/letter (AA-ZZ).

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

note 3 : some 850 birds are ringed from 2000 until 2003. Most of these rings are fallen off.

note 4 : all birds ringed during winter in city-parks.

note 5 : all rings have to be read from bottom to top.

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 3 : code used is number/number (00-99).

note 4 : some 850 red rings will be used from 2004 until 2010.

note 5 : all birds ringed during winter in city-parks.

note 6 : all rings have to be read from bottom to top.

Red ring with a white two alpha code.

note 1 : old red rings are turning pink.

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

note 3 : code used is lettter/letter (AA-ZZ).

note 4 : some 850 red rings will be used from 2004 until 2010.

note 5 : all birds ringed during winter in city-parks.

note 6 : all rings have to be read from bottom to top.
 

Yellow ring with black two numeric code (on left tarsus).

note 1 : used codes are number/number (00-99).

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

note 3 : old yellow rings are turning white.

note 3: some 850 birds are ringed from 1996 until 1999. Most of these rings are fallen off.

note 4: Since 2024 codes with a bar are used, used codes are A|A-Z|Z, 0|A-9|Z, A|0-Z|9 and 0|0-9|9

note 5 :