O
Ocreatus underwoodii - Booted Racquet-tail - Haut-de-chausses à palettes
Ocyceros gingalensis - Ceylon Grey Hornbill - Calao de Ceylan
Oena capensis – Namaqua Dove - Tourterelle masquée
Oenanthe hispanica – Black-eared Wheatear - Traquet oreillard
Oenanthe leucura – Black Wheatear - Traquet rieur
Onychognathus morio – Red-winged Starling - Rufipenne morio
Opisthocomus hoazin – Hoatzin - Hoazin huppé
Ortalis canicollis – Chaco Chachalaca - Ortalide du chaco
Ortalis ruficauda – Rufous-vented Chachalaca - Ortalide à ventre roux
Ortalis vetula – Plain Chachalaca – Ortalide chacamel
Orthorhynchus cristatus – Antillean Crested Hummingbird - Colibri huppé
Orthotomus sutorius – Common Tailorbird - Couturière à longue queue
Otis tarda – Great Bustard - Outarde barbue
Otus asio – Eastern Screech Owl - Petit-duc maculé
Otus bakkamoena – Indian Scops-owl - Petit-duc Indien
Otus ireneae – Sokoke Scops-Owl - Petit-duc d’Irène
Otus manadensis - Sulawesi Scops-owl - Petit-duc de Manado
Otus senegalensis – African Scops Owl – Petit-duc Africain
Oxyura australis – Blue-billed Duck - Erismature australe
Oxyura jamaicensis - Ruddy Duck - Erismature rousse
Oxyura maccoa – Maccoa Duck - Erismature maccoa