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The article presents a paper which discussed geographic variation in Alaskan Song Sparrows or Melospiza melodia. The researchers examined genetic and morphological characteristics of the Song Sparrows of northwestern North America. They stressed the importance of using multiple lines of evidence, genetic and morphological when evaluating subspecific status. A figure that shows map of Song Sparrow subspecies and collection locations used in genetic data analyses is presented. A pronounced east-to-west increase in individual body mass among subspecies was also observed.