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Oceanites oceanicus
Oceanodroma castro
Oceanodroma leucorhoa
Oceanodroma monorhis
Oena capensis
Oenanthe chrysopygia
Oenanthe cypriaca
Oenanthe deserti
Oenanthe finschii
Oenanthe hispanica
Oenanthe isabellina
Oenanthe leucopyga
Oenanthe leucura
Oenanthe lugens
Oenanthe moesta
Oenanthe monacha
Oenanthe oenanthe
Oenanthe picata
Oenanthe pleschanka
Oenanthe xanthoprymna
Onychognathus tristramii
Oriolus oriolus
Otis tarda
Otus brucei
Otus scops
Oxyura leucocephala