Small tanager with striking sexual dimorphism: male entirely black with bold white shoulder patch; female olive above and yellow below with gray head. Male most similar to White-lined Tanager but smaller with much more obvious white shoulder. Female confusing, could be mistaken for several other species of tanagers; always note small size and fairly thick bill. Typically found in pairs or small groups, usually with mixed feeding flocks, in forested habitats in lowlands and foothills.