"Yellow raspberries"

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Yellowsurada is an ostrich bird of the Seisopygid family, one of the Susourades that also respond to the Greek site. The scientific name of the species is Motacilla flava and includes 17 subspecies.
In Greece, the subspecies Motacilla flava feldegg Michahelles, 1830, responds as the most important reproductive taxon, but during migrations there is involvement of different populations and, often, it is extremely difficult to determine the identity of local subspecies, given their complex systematic (see Systematic Taxonomics and Suboid Tables). Multiplentical transitional populations during migrations belong – beyond M. f. feldegg – to subspecies M. f. flava and M. f. thunbergi, but more have been observed, several of which are intermediate hybrid populations (see also Migration in Greece).
Yellowsurada, with its many different colorations, particularly in the head area, is an insoluble taxonomic puzzle for scientists. Dozens (sic) taxa have been described as subspecies, the status of which has not been clarified and intense disagreements have been expressed, at times, and many researchers upgrade them to distinct species. The situation has become even more complicated since the introduction of molecular data.

World population trend
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Nomenclature
The scientific name of the genus, Motacilla, is Latin and has as root the verb moto "moto move", with clear reference to the characteristic movement of the rear part of the bird. This also applies to the English name Wagtail 'moving the tail'.

The same importance is attached to the Greek popular name "surada", with interesting etymology: [ETYM. < seisurad (precautionary assimilation) < seisura (< seisura, pb; e-sa-a, + tail) + paraspira-ada). Also, the words name of the bird "sesopygi", has the same conceptual characteristics: [ETYM. ( < beginning, p.a. + pygi < pygis < pygi. posterior)

The term flava in the scientific name of the species, as well as its popular names in English (Yellow Wagtail) and Greek language refer to the characteristic yellow wing of the bird.

Systematic Classification
The species was described by Linnaeus (N. Sweden, 1758), under its present name. It is a "challenge" for the science of Systematic Taxonomics, as it presents many and interrelated, problems between them. The situation is complicated by the intersections of existing populations, gender differences, the existence of two wings in males (reproductive and non-productive), the incomplete data - in some cases - and the entry of molecular data over the last decades. Relations between individual taxa remain largely unclear and further data is necessary to collect.

It probably forms superspecies with M. citre