Spectacled Warbler; Curruca Tomillera

5 species of Sylvia warbler can breed in this area and while the adult males are fairly easy to separate the females and juveniles can all be confusingly similar. All start out with dark eyes and pale eyerings, greyish legs and grey/ brown bodies. They slowly change over autumn and spring. Most species develop greyish or darker heads while the Spectacled remains tan. The Orpheans eyes soon turn yellow while those of the Sardinian and Subalpine turn red, as do their orbital rings. Whitethroat and Orphean retain dark grey legs while those of the others turn a brighter orange. I find late summer Spectacled and Subalpine juveniles virtually impossible to separate though the Spectacled should have warmer tan wings and a whitish throat while the Subalpine develops a more orange throat with white border. To add to the confusion they can all be found together as on this day. Subalpine have several sub-species and are widely variable, they can only be reliable separated by song but I cannot hear very well! The bird in the first 3 pictures is IMO Spectacled, the other one....