Black-headed Gull

Yellow ring with a black four alpha-numeric code (first letter "A" followed by two letters and one number).

note 1 : used codes are during 2001: AAA0-AAP9.

note 2 : used codes during 2002-2004 : AAR0-ACP7.

note 3 : used codes during 2005-2011: ACP8-AEH1.

note 4 : further codes used.

note 5 :

Yellow ring with a black four alpha-numeric code, starting letter "K". 

note 1 : used codes are K000-K999, KA00-KZ99 and K00A-K99A, K00C-K99C, K00E-K99E.

note 2 : 

Dark-green with a white four alpha-numeric code, starting letter 'C'.  

note 1 : up to 2014, a total of 1365 ring werd delieverd during 1995-1998.

note 2 :

Dark-green 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 or see below : 

https://app.bto.org/static/files/euring/Black-headed_Gull_UK.pdf

Dark-green ring with a white one alpha code (on left leg) and a dark-green ring with a one alpha code and metal ring (on other leg).

note 1 : letters AA to BL used.

note 2: birds are ringed in the nest during breeding season 2004 on Brownsea Island Poole harbour.

Combination of four rings (on right and left tibia).

note 1 : used colours are white, yellow, orange, red, blue, pistachio-green, dark-green and black.

Yellow wingtag with a two alpha-numeric code. 

note 1 : yellow wingtag has 1 or 2 letters/numbers.

note 2: between 1992 and 1995 1063 birds have been wingtagged (783 white, 265 yellow and 15 blue).

note 3: no more birds have been tagged since winter 1994/95.

note 4: blue wingtags are reserved for future in this program and most of the birds must have lost their tags (yellow looks very fade yellow, rather whitish).

White wingtag with a black two alpha-numeric code.

note 1 : white wingtag has 2 letters/numbers.

note 2: between 1992 and 1995 1063 birds have been wingtagged (783 white, 265 yellow and 15 blue).

note 3: no more birds have been tagged since winter 1994/95.

Pale-blue wingtag with a two alpha-numeric code (starting letter "A").

note 1 : between 1992 and 1995 1063 birds have been wingtagged (783 white, 265 yellow and 15 blue).

Dark-blue ring with a white four alpha-numeric code (starting letter "N" followed by one letter and two numbers).

note 1: code used is NA01-NA00 ; NC01-NC00 ; NE01-NE00 ; NH01-NH00 ; NJ01-NJ00 ; NK01-NK00 ; NL01-NL00 ; NM01-NM00 ; NN01-NN00 ; NP01-NP00 ; NR01-NR00 ; NS01-NS00 ; NT01-NT00 ; NU01-NU00 ; NV01-NV00 ; NX01-NX00 ; NY01-NY00.

note 2 : starting letters NH, NP used in Barcelona.

note 3 :