Spot-billed Ground-Tyrant Muscisaxicola maculirostris

Fairly small and drab terrestrial flycatcher of open rocky and stony slopes and valleys, and adjacent agricultural terraces in the Andes; also locally in desert lowlands mainly in winter. Virtual absence of field marks is a field mark: plumage unrelieved by strong contrast or color. Best told from other ground-tyrants by small size, faint dusky breast streaking, relatively short wings, and much stronger song. Also note yellow base of bill that is visible at close range.