The writing of this account was supported partly by National Science Foundation grant DEB-1354006 to KJB.
Ashwill, A., K. J. Burns, and C. H. Richart (2015). Opal-crowned Tanager (Tangara callophrys), version 1.0. In Neotropical Birds Online (T. S. Schulenberg, Editor). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/nb.opctan1.01