(© Luis y Rafael Salas, 2000)
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| English name | Nombre español | Orden | Familia | Nombre científico | |
|---|---|---|---|---|---|
| O | |||||
| Olivaceous Warbler | Zarcero pálido | Passeriformes | Muscicapidae | Hippolais pallida | |
| Oriole, Golden | Oropéndola | Passeriformes | Oriolidae | Oriolus oriolus | |
| Orphean Warbler | Curruca mirlona | Passeriformes | Muscicapidae | Sylvia hortensis | |
| Ortolan Bunting | Escribano hortelano | Passeriformes | Emberizidae | Emberiza hortulana | |
| Osprey | Águila pescadora | Falconiformes | Pandionidae | Pandion haliaetus | |
| Ouzel, Ring | Mirlo capiblanco | Passeriformes | Turdidae | Turdus torquatus | |
| Owl, Barn | Lechuza común | Strigiformes | Tytonidae | Tyto alba | |
| Owl, Eagle | Búho real | Strigiformes | Strigidae | Bubo bubo | |
| Owl, Little | Mochuelo europeo | Strigiformes | Strigidae | Athene noctua | |
| Owl, Long-eared | Búho chico | Strigiformes | Strigidae | Asio Otus | |
| Owl, Scops | Autillo | Strigiformes | Strigidae | Otus scops | |
| Owl, Short-eared | Búho campestre | Strigiformes | Strigidae | Asio flammeus | |
| Owl, Tawny | Cárabo común | Strigiformes | Strigidae | Strix aluco | |
| Owl, Tengmalm's | Mochuelo boreal | Strigiformes | Strigidae | Aegolius funereus | |
| Oystercatcher | Ostrero | Charadriiformes | Haematopodidae | Haematopus ostralegus | |
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