Common Tern

Black ring with a black three alpha code.

note 1 : some codes can have a check dot in the code.

note 2 : birds ringed in the Dutch inland.

note 3 : used codes are : FAA-FZZ,

Black ring with a black three alpha-numeric code.

note 1 : some codes can have a check dot in the code.

note 2 : birds ringed in the Dutch inland.

note 3 : used codes are : L00-L99, 00L-99L, 0L0-9L9.

note 4 :

Red ring with a white three numeric code.

note 1 : codes 700-799.

note 2 : birds ringed in Co Cork, Ireland.

note3 :
 

Black ring with a white three alpha code, starting letter "S".

note 1 : used codes : SAA - SZZ

Black ring with a white three alpha code and metal ring (on other leg).

note 1 : starting letter "A", followed by letters. Used codes : AAA-AZZ.

note 2 : birds ringed since 2023.

note 3 :

Red ring with a white three alpha code and metal ring (on other leg).

note 1 : starting letter "A", followed by letters. Used codes : AAA-AZZ.

note 2 : birds ringed since 2023.

note 3 :

Red ring with a white two numeric code (00-99) (on left leg) and metal ring (on the right leg).

note 1 :

Black ring with a white three alpha code, starting letter "L".

note 1 : used codes are : LAA-LZZ.

note 2 :

Dark-green ring with a white three alpha numeric code, starting letter "F" (used code : F/number/number) (on left leg) and BTO metal (on right leg).

note 1 : birds ringed in Buckinghamshire, UK.

note 2 :

Yellow ring with black 2 numeric code.

note 1 : birds are marked as pullis at the only colony in Northern Spain, located in the Bay of Santander (Cantabria).

note 2 : used digits are a code of two digits, staring in 00 to 99.

note 3 : 20-30 pulli ringed per year.

note 4 : by end-May some 11 pairs for 29 eggs were spotted.

note 5 :