White ring with a black four alpha code (on left tibia) 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.
note 2 : birds ringed since 2010.
note 3 : the ring can look pale yellow over time.
note 4 : used in Spain since 2010 and France since 2011.
note 5 :