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| Type | Common Name | [Latin Name] |
| Beardless-Tyrannulet | - Northern Beardless-Tyrannulet | [Camptostoma imberbe] |
| Bittern | - American Bittern | [Botaurus lentiginosus] |
| Bittern | - Least Bittern | [Ixobrychus exilis] |
| Blackbird | - Brewer's Blackbird | [Euphagus cyanocephalus] |
| Blackbird | - European Blackbird | [Turdus merula] |
| Blackbird | - Red-winged Blackbird | [Agelaius phoeniceus] |
| Blackbird | - Rusty Blackbird | [Euphagus carolinus] |
| Blackbird | - Yellow-headed Blackbird | [Xanthocephalus xanthocephalus] |
| Blackcap | - Blackcap | [Sylvia atricapilla] |
| Bluebird | - Eastern Bluebird | [Sialia sialis] |
| Bluebird | - Mountain Bluebird | [Sialia currucoides] |
| Bluebird | - Western Bluebird | [Sialia mexicana] |
| Bluethroat | - Bluethroat | [Luscinia svecica] |
| Bobolink | - Bobolink | [Dolichonyx oryzivorus] |
| Bobwhite | - Northern Bobwhite - Southern Texas | [Colinus virginianus texanus] |
| Booby | - Red-footed Booby | [Sula sula] |
| Brambling | - Brambling | [Fringilla montifringilla] |
| Brant | - Atlantic Brant - North American | [Branta bernicla hrota] |
| Brant | - Black Brant - North American | [Branta bernicla nigricans] |
| Bufflehead | - Bufflehead | [Bucephala albeola] |
| Bulbul | - Brown-eared Bulbul | [Ixos amaurotis] |
| Bunting | - Blue Bunting | [Cyanocompsa parellina] |
| Bunting | - Common Reed Bunting | [Emberiza schoeniclus] |
| Bunting | - Indigo Bunting | [Passerina cyanea] |
| Bunting | - Lark Bunting | [Calamospiza melanocorys] |
| Bunting | - McKay's Bunting | [Plectrophenax hyperboreus] |
| Bunting | - Painted Bunting | [Passerina ciris] |
| Bunting | - Rustic Bunting | [Emberiza rustica] |
| Bunting | - Siberian Meadow Bunting | [Emberiza cioides] |
| Bunting | - Snow Bunting | [Plectrophenax nivalis] |
| Bunting | - Varied Bunting | [Passerina versicolor] |
| Bushtit | - Bushtit - Pacific | [Psaltriparus minimus minimus] |
| Buzzard | - Common Buzzard | [Buteo buteo] |
| Buzzard | - Grey-faced Buzzard | [Butastur indicus] |