This volume serves as a comprehensive taxonomic and biological survey of the subfamily Thraupinae, aiming to provide a definitive reference for the identification and distribution of New World tanagers. Morton L. Isler and Phyllis R. Isler synthesize extensive ornithological data to document the diversity of these birds. The text functions as a primary resource for researchers and enthusiasts, utilizing detailed mapping and visual documentation to categorize the 242 recognized species within the group.

Experts and ornithologists recognize this work as a foundational reference text for the study of tanagers. Readers frequently note the technical density and the high quality of the visual plates, which remain essential for field identification and academic research.