Black-headed Gull

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: 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 : 

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.

Red ring with a white one alpha-numeric code (on left tarsus) and a red ring with one alpha-numeric code and metal ring on (right tibia).

note 1 : letters AA to AM used.

note 2: birds are ringed in the nest during breeding season 2004 on Normandy lagoon Lymington.

Red ring with a white two alpha-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 lettter/number (A2-Z9) and number/letter (1A-9Z). 

note 3 : some 850 red rings will be used from 2004 until 2010.

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 four alpha-numeric code.

note 1: code is PAU7.

note 2 : this bird was paired with a Mediterranean Gull and incubated ; normally this type of code is used for Mediterranean Gull.

Red ring with a white four alpha-numeric code :
- first letter N followed by a number/number/P  : N01P - N00P
- first letter N followed by a three alpha-numeric code.

note 1 : birds are ringed in the Douro Valley, Castilla y León (North-Spain).

note 2 :

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

note 1 : used codes are : V001-V000.

Yellow ring (on left leg) and metal ring (on right leg).

note 1 : during 1999 some 180 chicks have been ringed in Aberdeen, Scotland.

Yellow ring with a black three alpha-numeric code.

note 1 : used codes are 001-YYY.