Christopher T. Naugler, Laurene Ratcliffe, Character Release in Bird Song: A Test of the Acoustic Competition Hypothesis Using American Tree Sparrows Spizella arborea, Journal of Avian Biology, Vol. 25, No. 2 (Jun., 1994), pp. 142-148
No takes yet. Share an insight, caveat, or question.
Naugler et al. (1994) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: