Finland.

White ring with a black three alpha-numeric code, starting letter “C” (on left tarsus) and metal-ring (on right tarsus).

note 1 : 139 rings delivered in 2021 with code : C / number / letter.

note 2 :

Dark-blue ring with a white three alpha code (on right tarsus).

note 1 : direction of reading the 3 alpha code : from the top of the ring.

note 2 : birds ringed from 2020 onwards.

note 3 : used letters are : A, C, E, H, L, M, N, P, V, Z - 

note 4 : ringing site from 2020 onwards will be Finland.

note 5 : used codes are : CAA-CZZ.

note 6 : 

Dark-blue ring with a white 2 alpha (on right tarsus) and metal ring (on left tarsus).

note 1 : direction of reading the 2 alpha code : from the top of the ring.

note 2 : birds ringed from 2020 onwards.

note 3 : used letters are : A, C, E, H, L, M, N, P, V, Z - starting AA, AC etc.

note 4 : ringing site from 2020 onwards will be in South Finland.

note 5 :

Yellow ring with a two alpha code.

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

note 2 :

Combination of :
* orange ring with a two alpha code (on right tibia).
* orange ring (on right tibia).
* metal ring (on left tarsus).

note 1 : used letters : A, C, E, H, J, K, L, M, N, P, T, U, V, X, Y.

note 2 :

Combination of :
* a coded flag (with a two alpha / two alpha-numeric / two numeric code)
* a coded ring (with a four alpha code)

note 1 : code on flag and o nring differs.

note 2 : see picture.

note 3 :
 

White neckband with a black (all digits follow) three alpha-numeric code (letter "X" or "Y" / number / number).

note 1 : GPS-tags which also have black solar panels.

note 2 : no overlapping codes with the grey rings.

note 3 :

Blue neckring with a white three alpha code.

note 1 : code is one vertical and two horizontal.

note 2 :

Red neckring with a white three alpha-numeric code.

note 1 : code is one vertical and two horizontal.

White neckband with a black three alpha-numeric code.

note 1 :  GPS-tags which also have black solar panels.

note 2 :