Little Nightjar (Setopagis parvula) [XC51580]
by Sidnei S. dos Santos from Reserva Otamendi, Campana, Buenos Aires, Argentina (song)
Little Nightjar (Setopagis parvula) [XC272905]
by Peter Boesman from North-east of Taco Pozo, Chaco, Argentina (song)
Subspecies
Caprimulgus parvulus (Sibley and Monroe 1990, 1993) has been split into Little Nightjar (Setopagis parvula) and Todd's Nightjar (Setopagis heterura) following SACC (2006).
Formerly considered conspecific with Scrub Nightjar (Nyctidromus anthonyi), but differs in vocalizations. Birds of Santa Marta region (northern Colombia) have been considered a separate species, Todd's Nightjar (Setopagis heterura), again on basis of vocal differences, but these are normally considered insufficiently marked to justify such a split.
The following 2 subspecies are recognised:
heterura (Todd, 1915) - Northern Colombia and north-western and central-eastern Venezuela. Considered by some authors to be a distinct species, Todd's Nightjar (Setopagis heterura).
parvula Gould, 1837 - Eastern Peru through Brazil (south of Amazon) and south to northern Argentina and Uruguay.