Laidlaw Williams, Michael H. MacRoberts; Individual Variation in Songs of Dark-Eyed Juncos, The Condor: Ornithological Applications, Volume 79, Issue 1, 1
No takes yet. Share an insight, caveat, or question.
Williams et al. (1977) studied this question.
Synapse has enriched 4 closely related papers on similar clinical questions. Consider them for comparative context: