Extreme south-western Ecuador (El Oro, Loja) and north-western Peru (Tumbes, Piura).
 
Population
Estimated population is 2,500 - 9,999 (2010) and decreasing.
Status VU
Habitat destruction and degradation through deforestation and cattle grazing is the main threat.
For more information see BirdLife International Species Factsheet.
Voice
Song is a simple, short, descending trill. Call is a nasal, querulous 'squee-squirt'.
Grey-headed Antbird (Ampelornis griseiceps) [XC246086]
by Niels Krabbe from Bosque Protector El Tundo, Sozoranga, Loja, Ecuador (song)
Grey-headed Antbird (Ampelornis griseiceps) [XC246085]
by Roger Ahlman from Bosque Protector El Tundo, Sozoranga, Loja, Ecuador (call)
Subspecies
Genus appears not to represent a monophyletic grouping, but traditional arrangement maintained pending further phylogenetic study. Relationships uncertain. Possibly related to Esmeraldas Antbird (Sipia nigricauda).