Citrine Wagtail
Motacilla citreola
It is a slender, 15.5–17 cm long bird, with the long, constantly wagging tail characteristic of the genus 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.
ID text from Wikipedia, CC BY-SA 4.0
Eastern Yellow Wagtail
Motacilla tschutschensis
It is a slender 15–16 cm long bird, with the characteristic long, constantly wagging tail of its genus. The breeding adult male is basically olive-green above and yellow below. In other plumages, particularly first-winter birds but also many females, the yellow may be diluted by white. The heads of breeding males come in a variety of colours and patterns depending on subspecies.
ID text from Wikipedia, CC BY-SA 4.0
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