Yellow Wagtail has a large number of subspecies as well as many intergrades/hybrids. Many are not straightforward to assign and I

have included below a selection of photos of these wonderful birds,

 some obvious others not so obvious!

Kalloni, Lesbos  April 2011

male - Blue-headed Wagtail M. f. flava

Cape Drepanum, Cyprus  April 2012

male - another 'blue-headed' bird which suggested M. f. beema

although these are apparently not safely separable from M. f. flava

Cape Drepanum, Cyprus  April 2012

female

Kalloni Salt Pans, Lesbos  May 2015

female - this bird displays plumage, particularly the

yellow supercilium, associated with M. f. lutea

C'an Cuarassa, Mallorca   May 2013

a male of a nest-building pair which on locality should be M. f. iberiae

but note the lack of any noticeable supercilium making it appear

more like M. f. cinereocapilla

Paphos Sewage Plant, Cyprus  April 2015

male M. f. flava

Mandria, Cyprus  April 2014

female M. f. flava

Mandria, Cyprus  April 2014

male M. f. 'dombrowskii' - an intergrade between feldegg and flava

Christou River, Lesbos  April 2009

male - Black-headed Wagtail M. f. feldegg

Kalloni, Lesbos  April 2011

male - Black-headed Wagtail M. f. feldegg

Mandria, Cyprus  April 2014

male - Black-headed Wagtail M. f. feldegg

Near Paphos Sewage Plant, Cyprus  April 2015

male M. f. 'xanthophrys' - an intergrade (presumed)

between feldegg and lutea