Aves genera

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Genus	Common name	ranks
Oceanites Keyserling & Blasius	storm petrel	None
Ocreatus Gould	whitetip	tribe Heliantheini None
Ocyceros Hume	grey hornbill	1
Ocyphaps G.R. Gray	crested pigeon	tribe Phabini None
Odontophorus Vieillot	wood quails	None
Oena Swainson	Namaqua dove	tribe Turturini None
Oenanthe Vieillot	wheatear	None
Ognorhynchus Bonaparte	yellow-eared parrot	tribe Arini None
Onychoprion Wagler	tern	None
Onychorhynchus Fischer von Waldheim	Royal flycatcher	None
Onychostruthus Richmond	white-rumped snowfinch	None
Ophrysia Bonaparte	Himalayan quail, mountain quail	tribe Coturnicini None
Oporornis Baird	Mourning Warbler	None
Orchesticus Cabanis	tanager, grosbeak	None
Oreoica Gould	crested bellbird	None
Oreophasis G.R. Gray	horned guan	None
Oreopholus Jardine & Selby	dotterel	None
Oreortyx (Douglas) Baird	Mountain quail	None
Oreoscoptes Baird	sage thrasher	None
Oreostruthus De Vis		None
Oreothlypis Ridgway	warbler	None
Oriolus Linnaeus	Orioles	None
Ornorectes Iredale		None
Orthotomus Horsfield	tailorbird	None
Ortygornis Reichenbach	francolins	tribe Gallini None
Ortygospiza Sundevall		None
Ortyxelos Vieillot	quail-plover, lark buttonquail, lark-plover	None
Otis Linnaeus		None
Otus Pennant	Scops-Owl	None
Oxyura Bonaparte	stiff-tailed duck	tribe Oxyurini None