Gorgeous little bird with a small range in the Marañon Valley of northwestern Peru and adjacent border areas of Ecuador (south of Zumba). Note the black mask, white eyebrow and throat, rich chestnut underparts, and white edges to wing feathers. Similar to Elegant Crescentchest, but wings lack chestnut patches and are more strongly marked with white; ranges do not overlap. Marañon Crescentchest inhabits arid scrub where it stays low, often on the ground. Typical song is a series of 20 or more evenly spaced clicks.