Gulls

species: 
Great Black-backed Gull
scientific name: 
Larus marinus
notes: 

Orange ring with a black 4 alpha-numeric code (on left tarsus) [ letter, letter, number, T ] or [ letter, number, letter, T ] or [ number, letter, letter, T] and metal ring (on right tarsus) with as scheme site identifier is T (for Thames) (as last letter).

note 1 : unused codes are the letters E, I, O and Q and additionally, to avoid the remote possibility of any confusion with YLG in Spain, codes will not start with the letter B.

note 2 :

email sighting submit: 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Orange [O]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
colour-ring position (of the c-ring): 
Tarsus left.
countries where ringed: 
United Kingdom.
Images: 
Last letter (of the c-ring): 
T