GREGARIOUS MOVINGS OF LESSER-SPOTTED WOODPECKER DENDROCOPOS MINOR IN SOURCE OF ANGARA RIVER (THE AUTUMN PERIOD OF 2009)
In territory of dendrology park of Baikal museum Irkutsk Centre of Science the Siberian Branch of the Russian Academy of Science are registered by autumn of 2009 rather large flights (till 30-35 individuals) lesser-spotted woodpecker Den-drocopos minor. They moved along east macroslope of the Primorskyi ridge in a direction of work settlement Listvjanka. As such behaviour is not typical of this species, we undertake special studying of this phenomenon. The analysis of the collected materials for September-November has shown, that a principal cause of formation of flights at this species is fast accumulation of the birds moving one by one, during of mass autumn migratoryes before a large barrier - lake Baikal. Inherently they represent congestions of the birds which have stopped migratory in the elected direction (to the south). It causes gregarious movement of a lesser-spotted woodpecker along east macroslope of the Primorskyi ridge, looking like well expressed, but concerning short-term migration. The autumn gregarious movings registered at other species woodpecker of birds, on various sites of coasts of Baikal are discussed.