Sandwich Tern

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

note 1 : used codds are : KAA-KZZ.

note 2 :

Yellow ring with a black three alpha-numeric code (on one leg) and metal ring (on other leg).

note 1 : used codes are : K00-K99.

note 2 :

Dark-green ring with a white three alpha-numeric code (starting letter "M") and metal ring (on other leg).

note 1 : first letter "M" followed by other letters (used : A, C, F, H, J, L, M, N, P, R, T, U, V, W and X) and/or numbers (used : 0 till 9).

note 2 : birds ringed since 2022.

note 3 : generally, PVC ring on left tarsus.

note 4 :

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

note 1 : first letter "M" followed by other letters (used : A, C, F, H, J, L, M, N, P, R, T, U, V, W and X) and/or numbers (used : 0 till 9).

note 2 : birds ringed since 2022.

note 3 : generally, PVC ring on left tarsus.

note 4 :

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

note 1 : used codes are : 3 / letter / number.

note 2 : birds ringed on Blue Circle Island, Antrim.

note 3 :

Red ring with a white three alpha-numeric code and metal ring (on other tarsus).

note 1 : Always letter 'N' on first position; followed by one letter and one numeric (e.g. NV2 or N2V); or one numeric and one numeric (e.g. N12); or one letter and one letter (e.g. NVT)

note 2 : Always letter ‘H’ on first position; followed by one letter and one numeric (e.g. HV2 or H2V); or one numeric and one numeric (e.g. H12)

note 3 : Always letter ‘J' on first position, followed by one numeric and one numeric (e.g. J12); or one letter and one numeric and a ‘.' [dot] in the code in a random position (either between first and second digit, or between second and third) (e.g. J.2T or J2.V)

note 4: 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 5 : 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 6 : 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 7 : used letters are : A, C, F, H, K, L, N, P, R, S, T, V, X, Z.

note 8 :

Red ring with a white three alpha-numeric code, beginning letter 'K' (on one leg) and metal ring (on other leg).

note 1 :

White ring with black three numeric code.

note 1 : used codes are : 300-499.

note 2 : birds ringed across The Solent, England.

note 3 : 

Orange ring with a black two numeric code (on one leg) and metal ring (on other leg).

note 1 : used codes 00- 99, excl. 18 or 81 and 66 or 99.

note 2 :

Yellow ring with a black three alpha-numeric code (starting letter "M") and metal ring (on other leg).

note 1 : first letter "M" followed by other letters (used : A, C, F, H, J, L, M, N, P, R, T, U, V, W and X) and/or numbers (used : 0 till 9).

note 2 : birds ringed since 2021.

note 3 : generally, PVC ring on left tarsus.

note 4 :