Orange ring with a black 3 alpha code, starting letter A, B or C (on left leg and metal ring on right leg.
note 1 : birds ringed in county Cork, Ireland.
note 2 :
Red ring with a white three alpha code (starting A, B or C) (on left leg).
note 1 : birds ringed on the Isle of Man.
Combination of 4 c-rings : * 3 c-rings (on right leg). * 1 c-ring above metal (on left leg).
note 1 : used colours are : red, yellow, black ,white, green and blue.
note 2 : red used by VRS Meijendel, yellow by Amsterdamse Waterleiding Duinen, green by Van Lennep, blue by VRS Castricum.
note 3 :
Dark-green ring with a white two numeric code (on left tarsus) and metal ring (on other leg).
note 1 :
Dark-blue ring with a white 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.
Dark-blue ring with a white 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, W and X.
Dark-Blue ring with a white two alpha-numeric code.
Yellow ring with a black two alpha-numeric code.
note 1 : letter / number.
note 2 : birds ringed in Gers, FR.
Black ring with a white 2 alpha-code (on left leg) and metal ring (on right leg).
note 1 : birds ringed in Staffordshire, UK.
White ring with a black three alpha-numeric code, starting letter 'A' / number / number and metal ring.
note 1 : project started during 2016.