Boldly patterned sparrow of rainforest understory. Wings and back bright green; head black with white streaks over eye and down center of crown, and contrasting white throat. Male light gray below with black patches on sides of breast, or complete black breast band; female similar but underparts with buffy wash, and lacks black on breast. Unlikely to be confused with any other species in its range. Found in patches of denser understory within mature rainforest, along streams, in ravines, and in tree fall gaps. Frequently joins understory mixed species flocks, where it can be hard to detect as it scurries around the forest floor. Song and calls are very high pitched.