finished a little bit quicker than I'd expected: my picks for best bird collections. Others can chime in with their opinions (i.e. zooboy28 and NZ Jeremy), especially given that I don't get up to the North Island much.
SOUTH ISLAND:
Rather depressingly, the best collection of exotic birds in the South Island is at the
Dunedin Botanic Gardens where there is a very good aviary complex housing a lot of different parrot, finch and pigeon species (all of which come from private aviculturists, but relatively few of which can be seen in other public collections). There are also native parrots here (kea, South Island kaka, and some
Cyanoramphus).
For native birds the best South Island collection by a long shot is
Willowbank Wildlife Reserve in Christchurch, both in terms of species and (generally-speaking) in the way they are displayed. Species here include takahe, Campbell and Auckland Island teal, NZ falcon, kea, kaka, red- and yellow-crowned kakariki, NZ pigeon, morepork, North Island brown kiwi, at least two subspecies of weka, and many others. They are also one of the main participants in the Operation Nest Egg project (ONE) for Haast kiwi, Okarito kiwi and great spotted kiwi (public viewing tours of the incubation and rearing rooms enable possible views of these species, depending on what is there at the time). There are some exotic birds also, but the most unusual amongst them are blue and gold macaws and Himalayan monals (in other words, not very exciting)
Orana Park used to have a reasonably good collection of exotic birds (albeit mostly common species) in its first decade or so but they got phased out. Now they just have some childrens' playground birds (chickens, budgies, etc), ostrich, emu, and a few parrots. The native section is reasonably good, and includes a very big walk-though "forest" aviary and a walk-though kea aviary; interesting species include brown teal, blue duck, Antipodes Island parakeet and North Island saddleback.
The
Queenstown Kiwi Birdlife Park also has a good but small collection of native birds including North Island brown kiwi and (when I was last there) black stilt.
NORTH ISLAND:
For exotics,
Wellington Zoo has always been best but fairly recently it has taken a complete nose-dive. When I was last there (in 2008) I made some rather disparaging comments about their once-great "Bird Valley" where species like bantams and magpies were being used as space-fillers in aviaries where once noisy pittas, ibis and Nicobar pigeons had lived. They have the last pelican and frogmouth in NZ, and one of the few brolgas. The complete bird list for the zoo in 2008 was as follows (and this is one of the major zoos in the country):
ostrich
emu
North Island brown kiwi
Australian pelican
little pied shag
banded rail
brolga
white heron (great white egret)
Himalayan monal
golden pheasant
bantam
NZ scaup
Campbell Island teal
mandarin duck
Australian shelduck
Cape Barren goose
Derbyan parrot
sun conure
red-fronted macaw
North Island kaka
kea
red-tailed black cockatoo
Leadbeater's (pink, or Major Mitchell's) cockatoo
greater sulphur-crested cockatoo
NZ pigeon
Australian crested pigeon
emerald dove (green-winged pigeon)
tawny frogmouth
morepork
common kookaburra
Australian magpie
Their native bird collection isn't much to speak of, but will presumably improve once they finish the upcoming "Meet The Locals" development.
I've never been to
Hamilton Zoo but they have a pair of brolgas. Going by their website they seem to have a good selection of other stuff including Moluccan (salmon-crested) cockatoos, eclectus, yellow-bibbed lory, Australian shelduck, Himalayan monal and bleeding heart pigeon. This zoo may actually be better for exotics overall than Wellington Zoo is now. The native section also looks promising (there's a big walk-through aviary), with species including kokako, Antipodes Island parakeet, banded rail and NZ falcon.
Auckland Zoo has had some nice birds in the past but now the most exotic species are the flamingo flock (which, it must be said, are
the most exotic bird in NZ zoos) and a breeding pair of brolgas. There is only a small range of exotic birds otherwise and they are mostly parrots and pheasants. The native section has always been reasonably good, including also a big walk-through forest aviary. With the completion of the upcoming project Te Wao Nui it should improve considerably.
Franklin Zoo recently received a brolga from Hamilton Zoo but in terms of exotic species all other collections in the North Island are pretty standard, although because most are privately-run zoos they often have a far better range of parrots etc (they generally don't have access to more exotic stock and most don't have actual zoo licences and so cannot display anything that isn't available to private holders anyway - exceptions being places like Franklin, Brooklands and Pouakai which, while not having "zoo birds", do have "zoo mammals" such as monkeys and tigers)
For native birds, the best would have to be
Otorohanga Kiwi House and Native Bird Park. Apart from being the only place anywhere to have little spotted and great spotted kiwi on display (as well as North Island brown kiwi), they also have a wide range of other native species including kokako, NZ falcon, blue duck, kea, kaka, black stilt, Antipodes Island parakeet, Campbell Island teal, etc. Definitely a must-see if native birds are what you're after.
The
National Wildlife Centre at Mt. Bruce is in second-place. This is a DoC-operated breeding centre that is also open to the public (in contrast, Otorohanga is privately-owned). The number of species isn't great because the emphasis is on breeding specific species for conservation purposes - its not a bird garden - but species here include kokako, stitchbird, takahe, etc. I wrote a piece on it in 2008:
http://www.zoochat.com/17/national-wildlife-centre-mt-bruce-13759/
Nga Manu -
http://www.zoochat.com/17/nga-manu-nature-reserve-13760/ -and
Staglands are also quite good for natives. For wild natives,
Karori Wildlife Sanctuary (aka Zealandia) deserves a mention. A valley in the middle of Wellington city has been fenced off, predators removed, and birds introduced. Species include brown teal, kaka, stitchbird, saddleback, takahe, etc.