Common Tern

White ring with a black three alpha code, starting letter 'M'.

note 1 :

Green ring with a white three alpha code, starting letter 'M'.

note 1 :

Blue ring with a white three alpha code : starting letter 'M'.

note 1 :  

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

note 1 : birds ringed on Lake Starnberg : colony on a floating platform.

note 2 :

White legring with a black three alpha code (on tarsus right) and metal ring (on tarus left).

note 1 : to be read from bottom till top.

note 2 :     

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.