Photoperiodic conditions during molting of the Indian pied wagtail (Motacilla alba dukhunensis) and location of its winter habitats

The results of studying molting before the start of the mating season in Indian pied wagtail yearlings taken from the nests in the Lower Ob’ region and in the mid-Urals and kept in captivity for a year are studied. Reliable differences in the completeness of molting in northern birds as compared with it in mid-Ural birds are revealed, as are requirements for the wintering photoperiod. We assume the existence of a latitudinal differentiation during this period: 20°–30° N for mid-Ural birds and 10°–20° N for northern wagtails.