Gulls

species: 
Caspian Gull
scientific name: 
Larus cachinnans
notes: 

Yellow ring with a black 4 alpha-numeric code, starting or ending letter "P".

note 1 : first letter “P:" followed by and three numbers or letters or a combination of them.

note 2 : three numbers or letters or a combination of them before last letter “:P".
Used codes are : 001:P ~~ 999:P, 000:P, then A01:P ~~ A99:P, A00:P, B01:P, etc.
Then 1A1:P, ~~ 0Z0:P, then 01A:P ~~ 00Z:P.

note 3 :

note 3 : NOT used letters : A, B, C, D, E, G, H, J, K, L, M, N, P, R, S, T, U, V, W, X, Y, Z (i.e. excluding E or F, I (i), O and Q).

note 4 :

website sighting submit: 
Ornithological Station, Museum and Institute of Zoology of the Polish Academy of Sciences
email sighting submit: 
colour-ring type: 
Legring : one, coded.
colour-ring colour (of the c-ring): 
Yellow [Y]
colour-ring code (of the c-ring): 
Four alpha-numeric code (4 letters/numbers).
countries where ringed: 
Poland.
First letter/number (of the c-ring): 
P:
Last letter (of the c-ring): 
:P