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) [XC276246]
by Hans Matheve from Loja: Bosque de Hanne, 2 km WSW Utuana, Ecuador (song)
Grey-headed Antbird (Ampelornis griseiceps) [XC258523]
by John V. Moore from Loja: W of San Juan de Pozul, Ecuador (call, calls, bill or wing snaps)
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).