On the basis of own longterm materials (1968–2012) and the analysis of the accessible literature features of change of number and borders of areal of three most mass wintering species of birds of Eastern Siberia are considered: a Great Tit, a Coal Tit and Long-tailed Tit. It is shown that in second half XX centuries well-marked growth of their number and dilating of areal to the north are noted, up to the Central Yakutia. A principal cause of this processes is appreciable warming of a climate of northern hemisphere of the Earth, most likely, bound to the terminal of a climatic cycle of century level.