Limited genetic data suggest that Fiery-necked Nightjar is sister to Montane Nightjar Caprimulgus poliocephalus, not to Black-shouldered Nightjar Caprimulgus nigriscapularis (Han et al. 2010). Nonetheless, Black-shouldered Nightjar is lumped into Fiery-necked Nightjar due to complete overlap in vocalizations (Dowsett and Dowsett-Lemaire 1993) and morphometrics (Jackson 2013), and minimal plumage differences (Louette 1990).
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