Sandwich Tern

Orange flag with a black three alpha code (on right tarsus).

note 1 : birds ringed in Wales.

note 2 :

Dark-blue ring with a white three numeric code.

note 1 : used codes are 501-750.

note 2 : birds ringed at Inch Wildfowl Reserve, County Donegal.

note 3 : 

White 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.

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

note 3 :

White 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.

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

note 2 :

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 three alpha code, starting letter "S" or "Z".

note 1 : used codes are SAA - SZZ, ZAA-ZZZ.

note 2 :

Orange ring with a black three alpha code, starting letter 'K'.

note 1 : code is for Lady’s island Lake.

note 2 :

Dark-blue ring with a white three alpha-numeric code.

note 1 : used codes are T00-T99, 0T0-9T9, 00T-99T ... so always letter 'T' on various positions.

note 2 : birds ringed on the colony of 'Utopia' on Texel, The Netherlands end of June 2018.

note 3 :

Yellow ring with a black three alpha/numeric code, starting letter 'K' (on one leg) and metal ring (on other leg).

note 1 : used codes are : K0A-K9Z.

note 2 : birds ringed in Ireland.

note 3 : used letters are : A, B, C, D, F, H, J, K, L, N, P, S, T, V, Z.

note 4 :

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

note 1 : used letters are A, C, F, H, J, L, M, N, P, R, T, U, V, W and X.
note 2 : used numbers are 0 - 9.
note 3 : birds ringed since 2018.
note 4 : generally, PVC ring on left tarsus.
note 5 :