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Bird songs as illustration of behavioral diversification. How and why dialects arise? How long dialects exist in time and space? What are the reasons of song constancy over large regions? Geographical variations of song of some passerine bird species with different song organization, with different breeding range and taxonomic structure, song changes in zones of secondary contact and hybridization, temporal changes of song dialects. Examples from our studies on Acrocephalus, Phylloscopus and Luscinia.