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Bird song may provide female birds with signals of male quality. To investigate this potential for sexual selection via female choice we assessed the relationships between male song variation and male mating and reproductive success of the Savannah Sparrow (Passerculus sandwichensis Gmelin, 1789) over three years (2001)(2002)(2003) in a population of Savannah Sparrows near London, Ontario, Canada. We measured song rate, and temporal and frequency attributes of song structure, as possibledoi:10.1139/cjz-2019-0018 fatcat:vzitx3vcebhqnndpt7lj2h4vme