(hermanos Salas)
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| Nombre científico | Nombre español | Orden | Familia | English name |
|---|---|---|---|---|
| B | ||||
| Bombycilla garrulus | Ampelis europeo | Passeriformes | Bombycillidae | Waxwing |
| Botaurus lentiginosus | Avetoro lentiginoso | Ciconiiformes | Ardeidae | American Bittern |
| Botaurus stellaris | Avetoro común | Ciconiiformes | Ardeidae | Bittern |
| Branta bernicla | Barnacla carinegra | Anseriformes | Anatidae | Brent Goose |
| Branta canadensis | Barnacla canadiense | Anseriformes | Anatidae | Canada Goose |
| Branta leucopsis | Barnacla cariblanca | Anseriformes | Anatidae | Barnacle Goose |
| Branta ruficollis | Barnacla cuellirroja | Anseriformes | Anatidae | Red-breasted Goose |
| Bubo bubo | Búho real | Strigiformes | Strigidae | Eagle Owl |
| Bubulcus ibis | Garcilla bueyera | Ciconiiformes | Ardeidae | Cattle Egret |
| Bucanetes githagineus | Camachuelo trompetero | Passeriformes | Fringillidae | Trumpeter Finch |
| Bucephala clangula | Porrón osculado | Anseriformes | Anatidae | Goldeneye |
| Bulweria bulwerii | Petrel de Bulwer | Procellariiformes | Procellariidae | Bulwer's Petrel |
| Burhinus oedicnemus | Alcaraván | Charadriiformes | Burhinidae | Stone Curlew |
| Buteo buteo | Busardo ratonero | Falconiformes | Accipitridae | Buzzard |
| Buteo lagopus | Busardo calzado | Falconiformes | Accipitridae | Rough-legged Buzzard |
| Buteo rufinus | Busardo moro | Falconiformes | Accipitridae | Long-legged Buzzard |
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