| Common Name | Scientific name |
|---|---|
| Buff-breasted Sandpiper | Tryngites subruficollis |
| Buff-breasted Wren | Cantorchilus leucotis |
| Buff-collared Nightjar | Antrostomus ridgwayi |
| Buff-fronted Foliage-gleaner | Philydor rufum |
| Buff-fronted Quail-Dove | Zentrygon costaricensis |
| Buff-necked Ibis | Theristicus caudatus |
| Buff-rumped Warbler | Myiothlypis fulvicauda |
| Buff-throated Foliage-gleaner | Automolus ochrolaemus |
| Buff-throated Saltator | Saltator maximus |
| Bufflehead | Bucephala albeola |
| Buffy Tuftedcheek | Pseudocolaptes lawrencii |
| Buffy-crowned Wood-Partridge | Dendrortyx leucophrys |
| Buller's Shearwater | Ardenna bulleri |
| Bullock's Oriole | Icterus bullockii |
| Bulwer's Petrel | Bulweria bulwerii |
| Bumblebee Hummingbird | Atthis heloisa |
| Burrowing Owl | Athene cunicularia |
| Bushtit | Psaltriparus minimus |
| Bushy-crested Jay | Cyanocorax melanocyaneus |
| Cabanis's Ground-Sparrow | Melozone cabanisi |
| Cabanis's Wren | Cantorchilus modestus |
| Cabot's Tern | Thalasseus acuflavidus |
| Cackling Goose | Branta hutchinsii |
| Cactus Wren | Campylorhynchus brunneicapillus |
| Calandra Lark | Melanocorypha calandra |
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