In past, normally placed in Streptopelia, but more heavily built and has longer legs; alternatively placed in genus Columba, where linked with C. delegorguei. Recently shown to be sister-species of N. mayeri. Internal taxonomy confused: in past, birds from Aldabra erroneously placed in race aldabranus (origin of type specimen presumably mistaken), with those of Amirantes awarded race saturatus; birds of Assumption I were awarded a separate race, assumptionis; birds of Chagos Is sometimes awarded race chuni, but considered most likely to be hybrid picturatus x comorensis, possibly introduced from ships, although hybrid origin has been questioned#R. Extinct †rostratus differs from closest geographical and morphological form coppingeri by maroon vs pinkish-grey crown and mantle (1); upperparts in males dark grey-brown vs pale brownish-grey with chestnut on carpal area and purplish nape and mantle (2); largely grey vs purplish-pink breast, belly and tips of black neck spots (1); crimson vs purple cere, eyelids and feet (NHMUK specimen labels) (ns); smaller size (effect size –2.75, score 2); larger bill (effect size 1.795, score 1). Despite score here of 7, heavy hybridization with introduced S. p. picturatus means no check of characters now possible. Three extant subspecies recognized.
Introduced (picturatus) to Seychelles, Amirantes, Reunion and Mauritius; also (probably hybrids) to Diego Garcia I, in Chagos Archipelago.
Food and feeding
Status and conservation
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