Olive-crowned Crescentchest Melanopareia maximiliani

Spectacular but reclusive bird, most often located by its distinctive voice. In N end of range (to NW Bolivia) lives in thick grassy hillsides and Polylepis forest in the high Andes. S of Bolivia, in W Paraguay to central Argentina, expands into Chaco forest in lowlands, where it prefers thorn forest with dense understory. Song an evenly pitched series of metallic or dry notes. Population in central Argentina differs vocally, with a much faster song.