Subspecies of Yellow Wagtail (Motacilla flava)

[Fabian Schneider]

Hello,
I need help for to determined a certain number of Yellow Wagtail photographed this spring at the south of Switzerland.
N°1: special individual with a green head et with a small yellow supercillium
N°2:a femelle with a general colorvery grey and with the head dusky grey without supercillium (feldegg?). Sorry for the poor shot...
N°3+4: male of flavissima?
N°5: hybrid with thunbergi?

Everybody know a good internet site to determined the different subspecies of Yellow Wagtail?

Greetings

Fabian Schneider

[Christian Brinkman]

1st + 3rd and 4th seem to be all flavissima.
5 seems like an ordinary thunbergi to me, 2nd CY birds sometimes have extended white on their throats