Great Black-backed Gull

Yellow ring with a black 4 alpha-numeric code (starting letter 'T' followed by a colon and 3 numbers) (on left leg) and metal ring (on right leg).

note 1 : birds ringed in North East Scotland.

note 2 : starting 2011 28 birds have been ringed by early 2014. 

note 3 : 

Black ring with yellow 4 alpha-numeric code (on left leg) and metal ring (on right leg).

note 1 : all codes start with ‘T’.

note 2 : birds ringed in the UK, Isle of Man (British Isles).

note 3 : detail information on this page

note 4 :

Red ring with a white three alpha-numeric code (1 letter/1 number/1 letter)

note 1 : birds are ringed as pullus at a colony on the island of Eilean Hoan, North West Scotland.
note 2 : colour-ring on right leg ; BTO metal ring on left leg.
note 4 : used code for 2004: H (number) (letter) H1A-H3U (60 birds)
note 3 : used code for 2005: H (number) (letter) H3V-H3Y, H6A-H6C (8 birds)
note 5 : used code for 2006: H (number) (letter) H4A-H9Y (117 birds)

Yellow ring with a black three alpha-numeric code (1 letter and 2 numbers).
Yellow ring with a black three alpha-numeric code (1 letter/1 number/1 letter).

Project 1 – Caithness, Scotland.

note 1 : birds are ringed as pullus at the Caithness colonies, north of Helmsdale, North East Scotland.
note 2 : c-ring on left leg ; BTO metal ring on right leg.
note 3 : The following letters have not been used B, D, F, G, I.
note 4 : used code for 2002 : A00-A99. (100 birds)
note 5 : used code for 2003 : C01-C36, C41-C44 and C51-C61. (51 birds)
note 6 : used code for 2004 : C37-C38 and C45-C50. (8 birds)
note 7 : used code for 2005 : C39-C40 and C62-C72. (13 birds)
note 8 : used code for 2006 : C73-C90. (18 birds)
note 9 : used code for 2007 : C91-C00 and E31-E55. (35 birds)
note 10 : used code for 2008 : E01-E27. (27 birds)
note 11 : used code for 2009 : E56-E00 and H01-H14. (59 birds)
note 12 : used code for 2010 : H15-H00 and J01. (86 birds)
note 13 : used code for 2011 : J02-J69. (68 birds)note 14 : used code for 2012 : J70-J00. (32 birds)
note 15 : used codes for 2013 : (blue colour rings used)
note 16 : used codes for 2014 : (blue colour rings used)
note 17 : used codes for 2015 : (blue colour rings used)
note 18 : used codes for 2016 : L51-L58. (8 birds)
note 19 : used codes for 2017 : L59-L68. (10 birds)
note 20 : used codes for 2018 : L69-L70, L73-L74. (4 birds)
note 21 : used codes for 2019 : L75-L76 (2 birds)

Blue ring with a white three alpha-numeric (1 letter and 2 numbers)
Blue ring with a white three alpha-numeric code (1 letter/1 number/1 letter)

First project :
note 1 : birds are ringed as pullus at the Rothiesholm Head, Stronsay, Orkney, Scotland;
note 2 : the following letters have not been used B, D, F, G, I.
note 3 : colour-ring on left leg; BTO metal ring on right leg.
note 4 : used code for 2003 : A00-A99. (100 birds)
note 5 : used code for 2004 : C01-C00 and E51-E73. (123 birds)
note 6 : used code for 2005 : E01-E10 & E74-E87. (24 birds)
note 7 : used code for 2006 : E11-E21 and E88-E00. (24 birds)
note 8 : used code for 2007 : E22-E50 and H51-H00. (79 birds)
note 9 : used code for 2008 : H50-H76. (27 birds)

Second project :
note 1 : birds are ringed as pullus at a colony on the island of Eilean Hoan, North West Scotland.
note 2 : used code for 2003: H (number) (letter) H2A-H9T (104 birds)
note 3 : colour-ring on right leg ; BTO metal ring on left leg.

Third project :

note 1 : birds are ringed as pullus at the Caithness colonies, north of Helmsdale, North East Scotland.
note 2 : used code for 2012 : L01-L15. (15 birds)
note 3 : used codes for 2013 : L16-L30, L51. (14 birds)
note 4 : used codes for 2014 : L33-L70. (38 birds)
note 5 : used codes for 2015 : L71- L00, H81-H86. (36 birds)
note 6 : used codes for 2016 : H77-H80, H87-H94. (12 birds)