Vagrant to South Georgia and the South Sandwich Islands.
Unknown to Peru.
Breeds from central Chile (southern from Atacama) and south-western Argentina (southern from Neuquén and western Río Negro) south to Tierra del Fuego; migrates northern as far as central Bolivia, Paraguay and south-eastern Brazil (Rio Grande do Sul).
Rarity Status
Currently this species is not classified as a rarity in this country OR information has not been updated.
Population
Estimated population is unknown (2010).
Chilean Swallow (Tachycineta leucopyga) [XC52065]
by Bernabe Lopez-Lanus from Villa Pehuenia-Alumine, Neuquen, Argentina (song)
Chilean Swallow (Tachycineta leucopyga) [XC53523]
by Daniel Gonz\u00e1lez Amat from PN Lago Puelo, Chubut, Argentina (song)
Subspecies
No subspecies.
Originally described as Hirundo leucopyga (and specific epithet often still used), but that name invalid as preoccupied. This species (and, by extension, Tumbes Swallow (Tachycineta stolzmanni)), along with Tree Swallow (Tachycineta bicolor), White-winged Swallow (Tachycineta albiventer), White-rumped Swallow (Tachycineta leucorrhoa) and Mangrove Swallow (Tachycineta albilinea), sometimes placed in separate genus Iridoprocne, but DNA studies indicate close relationship of these taxa with clade consisting of Violet-green Swallow (Tachycineta thalassina), Golden Swallow (Tachycineta euchrysea) and Bahama Swallow (Tachycineta cyaneoviridis), and support placement of all in a single genus. Forms a superspecies with White-rumped Swallow (Tachycineta leucorrhoa) and formerly considered conspecific owing to similarities in morphology and voice, but comparison of DNA sequences supports treatment as separate species.
BirdLife International Species Factsheet