Dark-green ring with a white four alpha-numeric code (starting letter "N" followed by 3 digits alpha-numeric).
note 1 : used letters are : A, B, C, F, H, J, K, L, M, N, P, R, S, T, U, V, W and X.
note 2 : used numbers are 0-9.
note 3 : birds ringed since 2022.
note 4 :