Black-headed Gull

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: all birds ringed during winter in city-parks.

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

Yellow ring with 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 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: 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-numeric code (on left tarsus).

note 1 : used codes are letter/number (A1-Z9) and number/letter (1A-9Z)

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.

note 6 : 

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

note 1 : note 1: 283 pulli and 17 ad. were ringed during beginning June '98 in the Retszilas-Orspuszta colony.

note 2 : HM01-HM00 , HH01-HH00 and NJ01-HJ00 used in 1998 for breeding adult and pulli at Rétszilas-Orpuszta Fishponds.

note 3: HK01-HK00 used in 1998-1999-2000 mainly used for wintering gulls at the River Danube (Budapest) ; HN01-HN00 used in 2000-2001 mainly used for wintering gulls at the River Danube (Budapest).

note 4 : latest used HP01-HP00, HR01-HR00, HS01-HS00, HN01-HN00, HV01-HV00 and HU01-HU00. During 2008 and further on the codes H001-H000 are used.

note 5 : latest used : HT01-HT00, HX01-HX00, HZ01-HZ00, HG01-HG00, HW01-HW00, HE01-HE00, HL01-HL00, H(0-9)(0-9)A, H(0-9)(0-9)F, H(0-9)(0-9)H, H(0-9)(0-9)J, H(0-9)(0-9)K, H(0-9)(0-9)L, H(0-9)(0-9)N, H(0-9)(0-9)R.

note 6 : used codes are Hnnl ; Hlll ; Hnll where n=number and l=letter.