Ecological races of the Cuckoo parasitizing in nests of Redstarts on the territory of East Europe. - N.N. Balatsky. - Berkut. 3 (2). 1994. P. 117-120.
The breeding areas of the Cuckoo's populations parasitizing on three Redstart species are shown on the base of oological data. Genesis of ecological races of the Cuckoo is discussed. Probable way of their origin is suggested. [Russian].
Key words: Cuckoo, Redstart, nest parasite, host species, ecological race.