Terns

Yellow ring with a black three alpha-numeric code and metal ring (on other tarsus), starting letter N or H or J.

note 1 : the letter 'N' can be on first position followed by one letter and one numeric (e.g. NV2 or N2V) OR one numeric and one numeric (e.g. N12).

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 : Always numeric ‘2' on first position and a ‘.' [dot] in the code in a random position (either between first and second digit, or between second and third); followed by one numeric and one numeric (e.g. 2.25); or one letter and one numeric  (e.g. 2.2T or 22.V); or one letter and one letter (e.g. 2.VT or 2V.T)

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 :