The Citrine Wagtail or Yellow-headed Wagtail (Motacilla citreola) is a small songbird in the family Motacillidae. The term citrine refers to its yellowish colouration. Its systematics, phylogeny and taxonomy are subject of considerable debate in the early 21st century. This is because this bird forms a cryptic species complex with the Yellow Wagtail
It is a slender, 15.5–17 cm long bird, with the long, constantly wagging tail characteristic of thegenus Motacilla. The adult male in breeding plumage is basically grey or black above, with white on the remiges, and bright yellow below and on the entire head except for the black nape. In winter plumage, its yellow underparts may be diluted by white, and the head is brownish with a yellowish supercilium. Females look generally like washed-out versions of males in winter plumage.
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Dadri wetland - 15th Dec 2011