Fitness Correlates of Song Repertoire Size in Free‑Living Song Sparrows (Melospiza melodia) Reid, Jane M. ; Arcese, Peter ; Cassidy, Alice L. E. V. ; Hiebert, Sara M. ; Smith, James N. M. ; Stoddard, Philip K. ; Marr, Amy B. ; Keller, Lukas F. Abstract Publication: American Naturalist Pub Date: March 2005 DOI: 10.1086/428299 Bibcode: 2005ANat..165..299R