Black-crested Warbler is a typical Basileuterus warbler of the mountains of northwestern South America. It lives from Venezuela to northern Peru in edge habitat and low scrub at high elevations in Andes and adjacent coastal mountains. The species is olive above and yellow below with a black crown and lores interrupted by a yellow supercilium. Black-crested Warbler skulks in the undergrowth such as bamboo stands where it feeds on insects. Typically difficult to detect visually, this warbler gives a series of excited, sharp chip notes that often accelerate into a sweeter, musical song.