Very similar to the Campbell Island Shag, the Auckland Island Shag has a variable neck pattern with the black sometimes meeting across the foreneck, sometimes mottled and sometimes completely separated by white. These are the only shags on the Auckland Islands. They nest November to February on cliff ledges. Males have a variety of displays including "gaping" as seen here. Another common display is known as "kink-throating" but Goggling that term may produce unexpected results. This species is listed as "vulnerable" by IUCN because of its extremely limited breeding range confined to the Auckland Island. The entire world population is estimated to be about 1000 pairs. This species is lumped with the Campbell and Bounty Islands Shags by H&M4 following a more traditional biological species approach. Canon PowerShot SX50 HS.
References:
Marchant, S. & Higgins, P.J. (coordinating editors) 1990. Handbook of Australian, New Zealand & Antarctic Birds. Volume 1, Ratites to ducks. Melbourne, Oxford University Press.
Orta, J., Christie, D.A., Jutglar, F. & Kirwan, G.M. (2017). Auckland Shag (Phalacrocorax colensoi). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from http://www.hbw.com/node/52646 on 27 February 2017).
Shirihai, H. (2007) A Complete Guide to Antarctic Wildlife. The Birds and Marine Mammals of the Antarctic Continent and the Southern Ocean. 2nd edition. A&C Black, London.
Szabo, M.J. 2013 [updated 2015]. Auckland Islands shag. In Miskelly, C.M. (ed.) New Zealand Birds Online. www.nzbirdsonline.org.nz