A very widespread Neotropical passerine, the Common Bush-Tanager is found in highland regions virtually throughout Middle America, from Mexico southwards, and the Andean chain in South America, reaching its southernmost point in northwest Argentina. It is generally found in small (presumably family) groups, sometimes with mixed-species flocks in the undergrowth of cloud forests and their borders. Virtually all of the species’ many subspecific populations are characterized by having a white post-ocular spot, brownish-colored head, greener upperparts, and yellowish underparts. Their taxonomy is complex. Although South American taxa have yet to be subjected to detailed systematic scrutiny, those in Middle America have been suggested, on the basis of both genetic and morphological data, to represent at least five different species, of which four of them are endemic to Mexico. Undoubtedly, under such principles, it is probable that additional, multiple species are likely to be recognized under the Phylogenetic Species Concept over the rest of the Common Bush-Tanager’s range.