svartnebbrovtyrann Agriornis montanus

Widespread in the Andes and locally at lower elevations. Favors open and semiopen habitats from rocky and scrubby slopes to bogs and lakeshores; often around villages and ski lodges, where it nests inside buildings. Often seen on prominent perches; can be confiding, but also flies long distances. Identified in most of range by size and extensively white tail. Told from similar but much rarer and slightly bulkier White-tailed Shrike-Tyrant by slender, all-dark bill (pale below on young Black-billed), and pale eyes (darker on young).