Yellow Wagtails

Female Yellow Wagtail, Vrisa

flava (central Europe), near Faneromeni

thunbergi (destined for northern Fenno-Scandia), near Faneromeni

You can have hours of fun sifting through groups of Yellow Wagtails on Lesvos. Many different races pass through on their way north, and there's always the possibility (perhaps, likelihood) that what you're looking at is a mixture of two.

photos taken with Canon EOS 30D, EF 300mm f/4L IS USM