This online article in PDF format (236 pages,
1.89 MB download) by Graeme A. Taylor is part of
the Department of Conservation’s series on
threatened species.
A second article in PDF format (203 pages, 1.6
MB download) by Graeme A. Taylor, discussing
non-threatened seabirds, their habitat, and
conservation issues.
This page on the NZ Birds site presents a
commentary on shags by site manager Narena Olliver.
The website has information on many New Zealand
species, as well as news and links to related
sites.
More suggestions and sources
Ell, Gordon. Seashore birds of New
Zealand. Auckland: Bush Press, 1984.
Heather, Barrie D., and Hugh A. Robertson.
The field guide to the birds of New
Zealand. Rev. ed. Auckland: Viking, 2000.
Higgins, P. J., and others, eds. Handbook of
Australian, New Zealand and Antarctic birds. 6
vols. Melbourne: Royal Australasian Ornithologists
Union and Oxford University Press, 1990–2002.
Reader’s Digest complete book of New Zealand
birds. Auckland: Reed, 1985.