Common Tern

White ring with a 3 alpha code (on left tarsus) (to be read from bottom to top) and metal ring (on right tarsus).

note 1 : NOT used letters are : B, D, G, I, O, U, Y.

note 2 : most of the adults were ringed in Delfzijl, the rest is ringed in Eemshaven or Groningen.

note 3 : starting letter is : A, C , E or L.

note 4 :

White ring with a 2 alpha-numeric code (on left tarsus) (to be read from bottom to top) and metal ring (on right tarsus).

note 1 : NOT used letters are : B, D, G, I, O, U, Y.

note 5 : most of the adults were ringed in Delfzijl, the rest is ringed in Eemshaven or Groningen.

White ring with a 2 alpha code (to be read from bottom to top) and metal ring.

note 1 : NOT used letters are : B, D, G, I, O, U, Y.

note 2 : most of the adults were ringed in Delfzijl, the rest is ringed in Eemshaven or Groningen.

Yellow ring with black 2 alpha-numeric code (letter followed by a number).

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

note 2 : Codes used are A0, A1, A2....to Z9.

note 3 : 20-30 pullis could be ringed per year.

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

Black ring with white 3 alpha-numeric code.

note 1 :

Dark blue ring with a white 2 alpha-numeric code (on tarsus) and metal ring on the opposite tarsus.

note 1 : a joint project of the Research Institute for Nature and Forest/INBO, Bureau Waardenburg and Ringgroup Delta on breeding and feeding ecology. This project will run for the next five years. Some 30 birds ringed in 2010.

note 2 : the colour-ring is added to aid identification of birds (formerly) carrying transmitters in the breeding colonies in the southwest of The Netherlands. Reports from further afield are more than welcome !

White ring with a black 3 alpha code : letter "I" and 2 letters (on the left tarsus) and metal ring (on the right tarsus).

note 1 :

Blue ring with white 3 alpha-numeric code : letter E followed by 2 numbers (on left leg) and metal ring (on right leg).

note 1 : birds ringed in Berkshire or Tyne & Wear, UK

note 2 :

Orange ring with a black two numeric code.

note 1 : some rings have a dot '.' before the numbers.
 

Orange ring with a black two alpha code.

note 1 : some rings have a bar separating the letters or a dot '.' before the letters.