Black Petrel
Procellaria parkinsoni
The plumage of the black petrel is all black, as are its legs and bill except for pale sections on the bill. It is a medium-sized petrel: males average about 720 g (25 oz), females around 680 g (24 oz). It has an overall length of 46 cm (18 in) and a wingspan averaging 115 cm (45 in).
ID text from Wikipedia, CC BY-SA 4.0
Westland Petrel
Procellaria westlandica
The adult Westland petrel is a stocky bird, weighing around 1,100 grams (39 oz). It is entirely dark blackish-brown, with black legs and feet. Some individuals may have a few white feathers. The bill is pale yellow with a dark tip. Falla measured the female and male birds for his original description and pointed out that the male of the species measured slightly larger than the female. However the female specimen weighed slightly more than the male. It is one of the largest of the burrowing petrels.
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Black Petrel and Westland Petrel.