Common Tern

White ring with a black three alpha code : starting letter 'V'.

note 1 : used codes are VAA-VZZ.

note 2 : birds ringed from 2014 onwards on Griend, The Netherlands.

note 3 :  

Yellow ring with a black three alpha-numeric code, starting letter 'C' (on left leg) and metal ring (on right leg).   

note 1 : birds ringed in UK, county Surrey.

note 2 : used codes are : C.00 – C.99

note 3 :

Light-green ring with a black 3 alpha-numeric code : letter U followed by 2 numbers (on left leg) and metal ring (on right leg).

note 1 : birds ringed in Leicestershire, UK.

note 2 : used codes are U01-U99.

note 3 : birds ringed during 2014 and 2016.

note 4 :

Dark-blue ring with a white three alpha code, starting letter 'S' (on right tarsus) and metal ring (on left tarsus).  

note 1 : note 1 : this project starts running in Sečovlje Salina Nature Park & Škocjanski zatok Nature Reserve (Slovenia) from april 2014.

note 2 : an exception are codes with as second letter M, W, X and as third letter M, W.

note 3 : 

Dark-blue ring with a white three alpha-numeric code, starting letter 'S' followed by two numbers (on right tarsus) and metal ring (on left tarsus).  

note 1 : note 1 : this project starts running in Sečovlje Salina Nature Park & Škocjanski zatok Nature Reserve (Slovenia) from april 2014.

White ring with a black three alpha-numeric code, starting letter 'S' followed by two numbers (on right tarsus) and metal ring (on left tarsus).  

note 1 : note 1 : this project starts running in Sečovlje Salina Nature Park & Škocjanski zatok Nature Reserve (Slovenia) from april 2014.

Orange ring with a black three alpha-numeric code (on right leg) and metal ring (on left leg).

note 1 : used codes : letter-number-number since 2013 (A, F, G, H, J, K, L, M, N, P, T, U, V, W, Y.

note 2 : used codes : letter-letter-number since 2018.

note 3 : used codes : letter "A"-letter-number ; letter-number-number ; letter "C"-letter-number.

note 4 : used codes are : Ann ; Cnn ; Fnn ; Gnn ; Hnn ; Jnn ; Knn ; Lnn ; Mnn ; Nnn ; Pnn ; Tnn ; Unn ; Vnn ; Wnn ; Y01-Y80.

note 5 :

Yellow ring with a three alpha code, starting letter "T".

note 1 : used codes are TAA-TZZ.

note 2 : 

Yellow ring with a black three alpha code.

note 1 : used codes are FAA-FZZ.

note 2 : this project had run on two places in Northeast Germany from 2012 to 2016.

note 3 :

Black ring with a white 3 alpha-numeric code (starting letter 'I') (on left tibia).

note 1 :