Recent phylogenetic study based on plumage colour spectra indicated that this species formed a clade with A. prevostii, with A. veraguensis and A. dominicus as sister-species#R. Very closely related to A. prevostii, and occasionally regarded as conspecific, the two evidently replacing each other geographically, with at most very local sympatry in N Venezuela and perhaps elsewhere. Race iridescens has been placed in A. prevostii, because female supposedly resembles female of that species more than it does female nigricollis, but in reality females vary considerably, and in AMNH material female iridescens have a small amount of glittering green overlaid on a variable-length matt black ventral stripe, and thus tend slightly more towards nigricollis than to prevostii (on which ventral stripe starts with matt black and then switches to glittering green); given this and the greater resemblance of male iridescens to nigricollis, it seems reasonable to treat iridescens as a race of nigricollis, as do some other authors#R. Reported occurrence of iridescens in Colombia (arid upper Cauca Valley) erroneous, the birds apparently belonging instead to nominate nigricollis#R. Two subspecies currently recognized.
Food and feeding
Status and conservation
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