Sandwich Tern

Red ring with a white three alpha-numeric code.

note 1 : used codes are :  G00-G99, R00-R99, S00-99 and U00-99.

note 2 :

Red ring with a white three numeric code (300 - 499).

note 1 :

Yellow flag with a black five alpha-numeric code, starting letter "J", followed by number "0" and three numerics.

note 1 : vertical code on the front of the flag (see picture 2 and 3).

note 2 : there is a chance to mistake this with regular plastic ring (see picture 1).

note 3 :

Dark-blue ring with a white three numeric code (on one leg) and metal ring (on the other leg).

note 1 : the project started 2023.

note 2 : used codes are 751-999.

note 3 : birds are ringed on Hallig Norderoog, Germany.

note 4 : the rings are used on both nestlings and breeding adults.

note 5 :

Blue 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, X and B, D, E, G, K, S, Y, Z) and/or numbers (used : 0 till 9).

note 2 : birds ringed since 2023.

note 3 : generally, PVC ring on left tarsus.

note 4 :

Black 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, X and B, D, E, G, K, S, Y, Z) and/or numbers (used : 0 till 9).

note 2 : birds ringed since 2023.

note 3 : generally, PVC ring on left tarsus.

note 4 :

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

note 1 : birds ringed Cumbria, UK.

note 2 :

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

note 1 : used codes are ZAA-ZZZ.

note 2 :

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

note 1 : the project started in 2019, dark blue rings used from 2022.

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

note 1 : the project started in 2019, dark blue rings used from 2022.

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 :