Structure of western meadowlark (Sturnella neglecta) song repertoires

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Abstract
Each male western meadowlark sings a repertoire of 3-12 (average 6) song types, sometimes acquiring more with age. Song types within repertoires are not especially contrasting, sone type abundance is apparently randomly distributed, and neighboring birds share no more song types than distant birds. The results suggest tht song types are learned early in life, and that the particular identity of the song types learned is not important for communication.