Sandwich Tern

Dark-blue ring with a white three alpha code.

note 1 : used codes are TXA-TXX and TZA-TZK ... with TXA-TXX carry a solar GPS tracker on the back.

note 2 : birds ringed on the colony of 'Wagejot' on Texel, The Netherlands 2020.

note 3 :  code-reading from the bottom up.

note 4 : codes B-TAA-TVZ and TZL-TZZ were used on birds at the Prins Hendrikzanddijk, Texel (adults and juveniles).

note 5 :

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

note 1 : the project started in 2019, yellow rings used from 2020.

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

note 3 : rings are used on both nestlings and non-breeding adults.

note 4 :

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

note 1 : the project started in 2019, yellow rings used from 2020.

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 non-breeding adults.

note 4 :

White ring with a black three alpha code :
* letter 'V' followed by two letters (on left or right tarsus) and metal ring (on opposite tarsus).

note 1 :

Dark-green ring with a white three alpha-numeric code, starting number "4".

note 1 :

Dark-blue ring with a white three alpha code, starting letter "H".

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); or one letter and one letter (e.g. HVT)

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

note 7 :

Combination of :
* dark blue ring with a white 3 alpha-numeric code (on left leg)
* metal ring (on right leg).

note 1 : used codes are C00-C99.

note 2 : birds ringed in Cumbria, UK.

note 3 : 

Yellow ring with a black 3 alpha-numeric code (on left leg) and metal ring (on right leg).

note 1 : used codes are C00-C99.

note 2 : birds ringed in Cumbria, UK.

note 3 : 

Dark-green ring with a white 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 : 

Dark-green ring with a white three alpha-numeric code, starting letter "T".

note 1 :