Pictures: Teus Luijendijk

3 October 2011, de Koog, Texel NH

3 October 2011, de Koog, Texel NH

My third Isabelline for the isle of Texel, the second Daurian (the third being a Turkestan Shrike L. (isabellinus) phoenicuroides on 14th August 2002).
Note that there is a hint of rufous on the forecrown, which is actually more indicative for Turkestan Shrike... I personally think that the distinguishing field characters of juveniles of the two are very subtle and probably widely overlapping!