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Male white-crowned sparrows have song "dialects," acquired in about the first 100 days of life by learning from older males. In the laboratory an alien white-crowned sparrow dialect can be taught.… (More)
The phenomenon of "dialect" variation in bird song, appearing as a consistent difference in the predominant song type between one population and another of the same species, has a special interest… (More)
THE song of wild Oregon Juncos, Junco oreganus, is a "loose quavering trill all on the same pitch" (Peterson, 1941). In comparison with many species the song is thus a simple one, which was the… (More)