The subspecies leucocephala of the western yellow wagtail Motacilla flava is endemic to the Altai-Sayan Ecoregion (Central Asia). The occurrence of leucocephala is associated with saline water bodies and solonchak habitats. Its distribution, especially outside the breeding season, is still uncertain. The aim of this work is to better define the breeding range, migratory movements, and the wintering range of this subspecies and provide guidance to distinguish whiteheaded intraspecific hybrids from the true leucocephala subspecies.....