| Common Name | Scientific name |
|---|---|
| Beautiful Treerunner | Margarornis bellulus |
| Beautiful Hummingbird | Calothorax pulcher |
| Bearded Wood-Partridge | Dendrortyx barbatus |
| Bearded Screech-Owl | Megascops barbarus |
| Bearded Parrotbill | Panurus biarmicus |
| Bay-headed Tanager | Tangara gyrola |
| Bay-breasted Warbler | Setophaga castanea |
| Bay-breasted Cuckoo | Coccyzus rufigularis |
| Bay Wren | Cantorchilus nigricapillus |
| Bat Falcon | Falco rufigularis |
| Basul (Chachafruto) | Erythrina edulis |
| Barsino | Calophyllum brasiliense |
| Barrow's Goldeneye | Bucephala islandica |
| Barred Warbler | Sylvia nisoria |
| Barred Puffbird | Nystalus radiatus |
| Barred Parakeet | Bolborhynchus lineola |
| Barred Owl | Strix varia |
| Barred Hawk | Morphnarchus princeps |
| Barred Forest-Falcon | Micrastur ruficollis |
| Barred Becard | Pachyramphus versicolor |
| Barred Antshrike | Thamnophilus doliatus |
| Barolo Shearwater | Puffinus baroli |
| Barnacle Goose | Branta leucopsis |
| Barn Swallow | Hirundo rustica |
| Bare-throated Tiger-Heron | Tigrisoma mexicanum |
RingBase adheres to EURING codes.
