Sandwich Tern

Dark green ring with a white 3 alpha-numeric code (on left leg) (frist letter "C") and metal ring (on right leg).

note 1 : used codes are C00 -C99.

note 2 : birds ringed in Cumbria and Northumberland, UK.

note 3 : 

Yellow ring with a black three alpha-numeric code, starting letter "E" followed by two numbers.

note 1 : birds ringed at Sands of Forvie NNR, Newburgh, Aberdeenshire, Scotland.

note 2 :  used codes : Y00 - Y99.

note 3 : 
  

Yellow ring with a black three alpha-numeric code and metal ring.

note 1 : The letter 'N' on various positions in the code, always starting with a numeric and followed by a letter (e.g. 2NC) or starting with numeric and numeric followed by N (e.g. 23N).

note 2 : a joint project of the Research Institute for Nature and Forest/INBO, Bureau Waardenburg and Ringgroup Delta. This project started in 2010 and each year (except in 2011) both adults and juveniles have been colourringed.

note 3 : we use colour-rings in order to gain information on migration, habitat use, juvenile dispersal, age of return and recruitment to the breeding colonies in the southwest of The Netherlands or beyond.

note 4 : used letters are : A, C, F, H, K, L, N, P, R, S, T, V, X, Z.

note 5 : 

White ring with a black three alpha-numeric code and metal ring.

note 1 : The letter 'N' on various positions in the code, always starting with a numeric and followed by a letter (e.g. 2NC) or starting with numeric and numeric followed by N (e.g. 23N).

note 2 : a joint project of the Research Institute for Nature and Forest/INBO, Bureau Waardenburg and Ringgroup Delta. This project started in 2010 and each year (except in 2011) both adults and juveniles have been colourringed.

note 3 : we use colour-rings in order to gain information on migration, habitat use, juvenile dispersal, age of return and recruitment to the breeding colonies in the southwest of The Netherlands or beyond.

note 4 : used letters are : A, C, F, H, K, L, N, P, R, S, T, V, X, Z.

note 5 : 

Dark Green ring with a white 3 alpha-numeric code (left leg).

note 1 : used codes are : 0-9 excluding 3 & 4 at the start/ K / number.

note 2 : birds ringed in North Norfolk.

note 3 :

Yellow ring with a black 3 alpha-numeric code (left leg).

note 1 : used codes are : 0-9 excluding 3 & 4 at the start/ K / number.

note 2 : birds ringed in North Norfolk.

note 3 :

White ring with a black 3 alpha-numeric code (left leg).

note 1 : used codes are : 0-9 excluding 3 & 4 at the start/ K / number.

note 2 : birds ringed in North Norfolk.

note 3 :

Red ring with a white three alpha-numeric code, starting letter "L" (on one leg) and metal ring (on the other leg).

note 1 : red rings used from 2025.

note 2 : used letters are : A, C, E, H, J, K, L, N, P, R, S, T, U, V.

note 3 : the rings are used on both nestlings and adults.

note 4 :

Red ring with a white three alpha code, starting letter "L" (on one leg) and metal ring (on the other leg).

note 1 : red rings used from 2025.

note 2 : used letters are : A, C, E, H, J, K, L, N, P, R, S, T, U, V.

note 3 : the rings are used on both nestlings and adults.

note 4 :

Dark-green ring with a white three alpha-numeric code, first letter "K".

note 1 : used codds are : KA1 – KZ9 .

note 2 :