Audouin's Gull

White ring with a black four alpha-numeric code, starting number 2 or 3 ... followed by three letters (AAA-ZZZ).

note 1 : not used codes are 4AAA-4ZZZ and 8AAA-8ZZZ.

note 2 : 

Yellow ring with a black two numeric code. 

note 1 : used numbers are : 0 till 9.

note 2 :  

Yellow ring with a black two alpha-numeric code (letter/number OR number/letter). 

note 1 : used letters are A, C, E, F, H, J, K, L, N, M, P, R, S, T, U, V, W, X, Y, Z.

note 2 : used numbers are : 0 till 9.

note 3 : 

Yellow ring with a black three alpha-numeric code, starting letter "M".

note 1 : birds will be ringed at the Mediterranean port city of Al-Hoceima.

note 2 :

Dark-green ring with a white with three alpha-numeric code, starting letter "C".

note 1 :

Red ring with a black three alpha-numeric code.

note 1 : 261 chicks/birds were ringed during 1998-2003 and 8 recoveries were made and 139 chicks and adults were ringed in breeding colonies in the Aegean Sea, Greece, during 2007, 2009 and 2010.
 

Yellow ring with a black two alpha code. 

note 1 : used codes are A, C, E, F, H, J, K, L, N, M, P, R, S, T, U, V, W, X, Y, Z.

note 2 : during 2003 only 6 birds were ringed.

White ring with a black four alpha-numeric code.

note 1 : starting letter is not 'K'.

note 2 : 

White ring with a black three alpha-numeric code (starting letter NOT 'I') 

note 1 :

Yellow ring with a three alpha-numeric code, starting number '0' or '1'.

note 1 :