A medium-sized, gray-brown warbler that looks very similar to other species. Note the rather stout bill and broad dark tail. Smaller and browner than Olive-tree Warbler and larger than Eastern Olivaceous Warbler. Wing panel is not as prominent as that of Olive-tree Warbler. Breeds on scrubby hillsides and river valleys; occasionally in flatter lowlands. During non-breeding season, found in a variety of wooded or brushy habitats. Sings from prominent perches—a repetitive, rapid mix of musical and scratchy phrases. Call is a harsh "chak."