Hombron & Jacquinot, 1841
The Auckland merganser or Auckland Islands merganser (Mergus australis) was a typical merganser which is now extinct.
This duck was similar in size to the red-breasted merganser. The adult male had a dark reddish-brown head, crest and neck, with bluish black mantle and tail and slate grey wings. The female was slightly smaller with a shorter crest.
This bird was first collected when a French expedition led by the explorer Jules Dumont d'Urville on the ships L'Astrolabe and La Zelee visited the Auckland Islands in 1840. Its decline was caused by a combination of hunting and predation by introduced mammals. The bird was not flightless, but rather hard to flush; it preferred to hide between rocks when pursued. The last sighting was of a pair shot on January 9, 1902. It was not found in a 1909 search, and a thorough 1972/1973 exploration of possible habitat concluded that it was long extinct (Williams & Weller, 1974).
Subsequent fossil discoveries suggest that this merganser was previously resident on the South Island and Stewart Island/Rakiura in New Zealand. Fossils of a subspecies or closely related species have also been found on the Chatham Islands. There exists a short remark mentioning "a merganser" found on Campbell Island in McCormick (1842), but this may just as well refer to the semi-marine Campbell teal which is otherwise missing in his notes: he only mentions the Pacific black duck ("a New Zealand species of duck").
- McCormick, Robert (1842): A sketch of the Antarctic regions, embracing a few passing remarks, geographical and ornithological. Tasmanian Journal of Natural Sciences 1(4): 241-247. PDF fulltext
- Williams, G. R. & Weller, M. W.. (1974): Unsuccessful search for the Auckland Islands Merganser (Mergus australis). Notornis 21(3): 246-249. PDF fulltext
- Southern Merganser. Mergus australis. by Paul Martinson. Artwork produced for the book Extinct Birds of New Zealand, by Alan Tennyson, Te Papa Press, Wellington, 2006