Breeding of Great Tit in concrete poles of contact system of the railway. - V.N. Grishchenko, E.D. Yablonovska-Grishchenko. - Berkut. 13 (1). 2004. - P. 12.
6 pairs breeding in pilofacturing holes of poles along the railway were found in Kyiv region in 2004. [Rusian].