A denizen of mature montane forests wherein it feeds low in thickets and shrubs. Often found in pairs, but sometimes in mixed feeding flocks. Eye-catching, with bright green back and gray crown contrasting sharply with near white underparts. Named for the bold white stripe in otherwise black primaries. Similar Green-tailed Ground Warbler has red eyes, grayer underparts, and lacks white in wing. Calls include high sharp “tsee” and a brief, upslurred “tswee.” Song is a low chatter.