The Patagonian Forest Earthcreeper (Upucerthia saturatior) is a species of bird in the ovenbird family

Ovenbird (family)

Ovenbirds or furnariids are a large family of small suboscine passerine birds found in Mexico, and Central and South America. They form the family Furnariidae...

 Furnariidae. The species was described in 1900 by W.E.D. Scott, but was listed as a subspecies

Subspecies

Subspecies in biological classification, is either a taxonomic rank subordinate to species, ora taxonomic unit in that rank . A subspecies cannot be recognized in isolation: a species will either be recognized as having no subspecies at all or two or more, never just one...

 of the Scale-throated Earthcreeper

Scale-throated Earthcreeper

The Scaly-throated Earthcreeper is a species of bird in the Furnariidae family. It is found in Argentina, Bolivia, Chile, Peru, and Uruguay. Its natural habitats are subtropical or tropical dry shrubland, subtropical or tropical high-altitude shrubland, and subtropical or tropical high-altitude...

 in Chapman in 1919. A 2009 paper elevated it back up to species status.

The Patagonian Forest Earthcreeper is found in Argentina

Argentina

Argentina , officially the Argentine Republic , is the second largest country in South America by land area, after Brazil. It is constituted as a federation of 23 provinces and an autonomous city, Buenos Aires...

 and Chile

Chile

Chile ,officially the Republic of Chile , is a country in South America occupying a long, narrow coastal strip between the Andes mountains to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, and the Drake Passage in the far...

. It is thought to undertake some movements

Bird migration

Bird migration is the regular seasonal journey undertaken by many species of birds. Bird movements include those made in response to changes in food availability, habitat or weather. Sometimes, journeys are not termed "true migration" because they are irregular or in only one direction...

 during the winter, with some individuals possibly crossing the Andes

Andes

The Andes is the world's longest continental mountain range. It is a continual range of highlands along the western coast of South America. This range is about long, about to wide , and of an average height of about .Along its length, the Andes is split into several ranges, which are separated...

.