(hermanos Salas)
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| Nombre científico | Nombre español | Orden | Familia | English name |
|---|---|---|---|---|
| O | ||||
| Oceanites oceanicus | Paíño de Wilson | Procellariiformes | Hydrobatidae | Wilson's Storm-petrel |
| Oceanodroma castro | Paíño de Madeira | Procellariiformes | Hydrobatidae | Madeiran Storm-petrel |
| Oceanodroma leucorhoa | Paíño boreal | Procellariiformes | Hydrobatidae | Leach's Storm-petrel |
| Oceanodroma monorhis | Paíño de Swinhoe | Procellariiformes | Hydrobatidae | Swinhoe's Storm-petrel |
| Oenanthe hispanica | Collalba rubia | Passeriformes | Turdidae | Black-eared Wheatear |
| Oenanthe leucura | Collalba negra | Passeriformes | Turdidae | Black Wheatear |
| Oenanthe oenanthe | Collalba gris | Passeriformes | Turdidae | Northern Wheatear |
| Oriolus oriolus | Oropéndola | Passeriformes | Oriolidae | Golden Oriole |
| Otis tarda | Avutarda | Gruiformes | Otididae | Great Bustard |
| Otis tetrax | Avutarda | Gruiformes | Otididae | Great Bustard |
| Otus scops | Autillo | Strigiformes | Strigidae | Scops Owl |
| Oxyura jamaicensis | Malvasía canela | Anseriformes | Anatidae | Ruddy Duck |
| Oxyura leucocephala | Malvasía | Anseriformes | Anatidae | White-headed Duck |
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