- Nesofregetta fuliginosa Polynesian Storm-Petrel
- Nesoptilotis flavicollis Yellow-throated Honeyeater
- Nesoptilotis leucotis White-eared Honeyeater
- Nestor meridionalis New Zealand Kaka
- Nestor notabilis Kea
- Nestor productus Norfolk Island Kaka
- Nettapus coromandelianus Cotton Pygmy-goose
- Nettapus pulchellus Green Pygmy-goose
- Ninox albifacies Laughing Owl
- Ninox boobook Southern Boobook
- Ninox connivens Barking Owl
- Ninox japonica Northern Boobook
- Ninox leucopsis Tasmanian Boobook
- Ninox natalis Christmas Island Boobook
- Ninox novaeseelandiae Tasman Morepork
- Ninox rufa Rufous Owl
- Ninox scutulata Brown Boobook
- Ninox strenua Powerful Owl
- Northiella haematogaster Bluebonnet
- Northiella narethae Naretha Bluebonnet
- Notiomystis cincta Stitchbird
- Numenius arquata Eurasian Curlew
- Numenius hudsonicus Alaskan Whimbrel
- Numenius madagascariensis Far Eastern Curlew
- Numenius minutus Little Curlew
- Numenius phaeopus Whimbrel
- Numenius tahitiensis Bristle-thighed Curlew
- Numida meleagris Helmeted Guineafowl
- Nycticorax caledonicus Nankeen Night-Heron
- Nycticorax nycticorax Black-crowned Night Heron
- Nymphicus hollandicus Cockatiel
- Oceanites oceanicus Wilson’s Storm-Petrel
- Ocyphaps lophotes Crested Pigeon
- Oenanthe isabellina Isabelline Wheatear
- Oenanthe oenanthe Northern Wheatear
- Onychoprion aleuticus Aleutian Tern
- Onychoprion anaethetus Bridled Tern
- Onychoprion fuscatus Sooty Tern
- Onychoprion lunatus Spectacled Tern
- Oreoica gutturalis Crested Bellbird
- Oreoscopus gutturalis Fernwren
- Origma solitaria Rockwarbler
- Oriolus chinensis Black-naped Oriole
- Oriolus flavocinctus Green Oriole
- Oriolus sagittatus Olive-backed Oriole
- Orthonyx spaldingii Chowchilla
- Orthonyx temminckii Australian Logrunner
- Otus sunia Oriental Scops-Owl
- Oxyura australis Blue-billed Duck
- Oxyura vittata Lake Duck
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