White wingtag with a black four alpha-numeric code, start with the letters "BR" (to denote "Aeropuerto Adolfo Suárez Madrid-Barajas") and two alpha-numeric digits.
note 1 : used letters are A, C, E, F, G, H, J, K, L, M, N, O, P, R, S, T, U, V, W, X, Y and Z.
note 2 : used numbers are 0 - 9.
note 3 : birds ringed since 2021.
note 4 : pvc on the leg too.
note 5 :