A unique NZ species - Whenua Hou diving petrel
While both DOC and NZ birds online refer to the South Georgian diving petrel, Wikipedia differentiates between the South Georgian species and a new species, the Whenua Hou diving petrel.
A somewhat dense academic document explains the difference:
Differences in breeding habitat and results from a preliminary molecular analysis indicated that the New Zealand population of the South Georgian Diving Petrel (Pelecanoides georgicus) was a distinct, yet undescribed, species.
Results show that individuals from New Zealand differ significantly from P. georgicus from all other populations as following: 1) longer wings, 2) longer outer tail feathers, 3) deeper bills, 4) longer heads, 5) longer tarsi, 6) limited collar extent, 7) greater extent of contrasting scapulars, 8) larger contrasting markings on the secondaries, 9) paler ear coverts, 10) paler collars, and 11) paler flanks.
By referring to that article, I can clearly see that these two photos show the correct bird, simply by looking at the white markings on the wings. Most of the other differences require other birds for comparison. The markings are going to be pretty important in the colouring phase of this drawing.
Habitat - Whenua Hou
Codfish Island or Whenua Hou is a small island (14 km2 or 5.4 sq mi) located to the west of Stewart Island/Rakiura in southern New Zealand. It reaches a height of 250 m (820 ft) close to the south coast.
The English name "Codfish Island" refers to the endemic blue cod or rawaru / pakirikiri, which is fished commercially in surrounding waters by trapping in baited pots. The Māori-language name "Whenua Hou" means "new land". Codfish Island is home to Sirocco, an internationally famous kakapo, a rare species of parrot.
The sole remaining breeding ground in New Zealand is on Codfish Island, near Stewart Island. The birds formerly nested on Enderby and Dundas Islands at the Auckland Islands. Subfossil bones indicate they previously nested on Stewart Island and possibly on Chatham and Macquarie Islands. [...]
On Codfish Island the birds nest in sand dunes behind Sealers Bay. Some nests are at the base of dunes at the back of the beach whereas others are amongst native or introduced coastal dune vegetation on the dune slopes.
All nests are within 100 m of the sea. Nest sites are in very unstable sand and it is nearly impossible to access the nests without destroying these sites.
Drawing the Whenua Hou diving petrel
My first observations are that this bird looks a great deal like a couple of the other petrels that I have drawn recently, particularly the tāiko (the bird, not the drum), although it's a much larger bird than this one. I can also see a much shorter tail, and different-coloured feet.
The weather here is really odd - it's very hard to concentrate and settle down to focus correctly on drawing.
I'm going to give it my best shot.
In these pictures, I am referring to the clearest pictures I can find of beak contours and head/neck colouring.
My initial quick outlines need considerable rework - I want to be sure that I am representing a recognisable, if stylised, Whenua Hou diving petrel.
Because there are so few pictures of the actual birds just being birds, I have used reference photos of other South Georgian petrels for my outline sketches, and then I add in the colouration that identifies the correct type of bird. That's why you can see different stippling patterns on the belly in the draft, which then disappear in the final.
I use bright green to help me identify the white areas that are left to colour, as these become transparent when I create a repeat - so if the background colour is purple, for example, all of these areas will also be purple.
And here they are, fully coloured! As with all my designs, once they are completed, the colours may change to ensure a more consistent overall effect, which is why I make sure that I capture all of the variants in each picture.