オビオタネワリ Catamenia analis

Small finchlike bird with large range from Colombia to Argentina. Primarily found at high elevations in the Andes, but occurs lower towards the southern part of its range. Male is gray overall with stout yellow bill, rufous undertail coverts, and small white mark on wing. Look for white in tail in flight. Female is brownish and streaky with dingy bill. Look for pairs or flocks in open habitats including disturbed agricultural areas and dry grasslands.