Yellow ring with a black two alpha code and metal ring.
note 1 : most birds are ringed in 2010-2011 in Friesland and Groningen, The Netherlands
note 2 : used letters are A,B,C,E,F,H,I,J,K,L,N,O,P,R,S,T,U,V,X,Y,Z.
note 3 :
Green wingtag with white 2 alpha-numeric code.
note 1 : used codes are : A1,
note 2 : birds ringed during november 2010.
