Naming
It has been lumped together with the plain-breasted earthcreeper based on song, continuous song, duet, and call.References:
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Buff-breasted earthcreeper
Upucerthia validirostris
The buff-breasted earthcreeper is a species of bird in the family Furnariidae. It is found throughout the Puna grassland and mountains of northwestern Argentina. Its natural habitats are subtropical or tropical high-altitude shrubland and subtropical or tropical high-altitude grassland.
