There are two subspecies of New Zealand pigeon, Hemiphaga novaseelandiae: H. n. novaseelandiae of mainland New Zealand and the Norfolk pigeon (H. n. spadicea) of Norfolk Island, now extinct. The subspecies differed in their plumage colour and shape.[1]
In 2001, it was proposed that a third subspecies, H. n. chathamensis or the Chatham Island pigeon, was distinct enough to be raised to full species status as H. chathamensis.[2] This has since been accepted by most authorities.[3][4]
^James, R. E. (1995). Breeding ecology of the New Zealand pigeon at Wenderholm Regional Park. p93. School of Environmental and Marine Science. University of Auckland, Auckland.
^Millener, P. R., and R. G. Powlesland. (2001). The Chatham Island pigeon (Chatham pigeon) deserves full species status; Hemiphaga chathamensis (Rothschild 1891); Aves: Columbidae. Journal of the Royal Society of New Zealand31:365–383.
^Jobling, James A. (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 189. ISBN978-1-4081-2501-4.
^Gill, Frank; Donsker, David; Rasmussen, Pamela, eds. (2020). "Pigeons". IOC World Bird List Version 10.1. International Ornithologists' Union. Retrieved 16 March 2020.