The white-chinned thistletail is a species of bird in the family Furnariidae and the order Passeriformes.
It measures from 18 to 20 cm and weighs from 14 to 20 g. Both sexes are similar. It has brown to greyish iris, greyish legs and bill with upper jaw black to grey and lower dark with light base. The nominal breed has slightly conspicuous greyish supercilium, whitish eye ring, blackish face and lores region to dark brown, crown and dark reddish brown upper parts. Its wings have a brighter tint, it has long tail, graduated and forked with appearance strayed. It has a white spot on the chin and other greyish lower parts with brownish tint on the sides.
It is found in the Andes from western Venezuela to central Peru. In Colombia it is found from 2300 to 3600 m above sea level in the Eastern Cordillera from the south of the department of Norte de Santander to the south of Cundinamarca and in a small region of southern Santander. Also in the Central mountain range in the south of the department of Caldas, east of Risaralda and Quindío, north of Tolima, south of the department of Huila, southeast of Cauca, east of Nariño and west of Putumayo.
Its natural habitats are subtropical or tropical moist montane forests and subtropical or tropical high-altitude grassland.
It feeds mainly on arthropods and sometimes on fruits.
It remains alone, in couples and rarely in mixed flocks. It captures its prey by gleaning in the foliage and in small branches of the underbrush, sometimes performing acrobatic maneuvers. When alarmed keeps the tail straight.