Niceforo's pintail was darker and richer in colouration than the nearest other subspecies, the Chilean pintail A. g. spinicauda, with the head and neck more streaked, the crown dark brown and with a less pointed tail.

Robert Cushman Murphy was the first to demonstrate that it is a pintail, its closest relatives the yellow-billed pintails of South America. Niceforo's pintail is an extinct subspecies of the yellow-billed pintail, a duck in the dabbling duck subfamily Anatinae. One of three subspecies, it was found in central Colombia but became extinct in the 1950s, being last seen in 1952.

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https://en.m.wikipedia.org/wiki/Niceforo%27s_pintail