Whiskered Tern

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

note 1 :

Red ring with a white 3 alpha-numerics code (on left leg) and metal ring (on right leg).

note 1 :

Blue ring with a white three alpha code, starting letter "C" followed by two letters.

note 1 : during 2024 some 30 breeding pairs will be ringed near the Polish border.

note 2 :

Yellow flags with a black three alpha-numeric code (repeated also on the head of the flag)  starting letters: A, C, E, P, K, R, S, T, U, X, Y and additionally two numbers.

note 1 :

Yellow ring with a black two numeric code (on left tarsus) and metal ring (on right leg).

note 1 : used numbers are : 0 - 9.

note 2 : birds ringed since 2022.

note 3 :

Yellow ring with a black two alpha code (on left tarsus) and metal ring (on right leg).

note 1 : used letters are: A, C, F, H, J, L, M, N, P, R, T, U, V and X.

note 2 : birds ringed since 2022.

note 3 :

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

note 1 : used letters are: A, C, F, H, J, L, M, N, P, R, T, U, V and X.

note 2 : used numbers are : 0 - 9.

note 3 : birds ringed since 2022.

note 4 :

Green ring with a 3 alpha code (on left leg) and metal ring (on right leg).

note 1 : used codes : AAA until ZZZ.

note 2 :

White flag with a black two alpha code (on right tarsus) and metal ring (on left tarsus).

note 1 :

White flag with a black three alpha-numeric code.

note 1 :