- Baird's Sandpiper
- Bald Eagle
- Baltimore Oriole
- Barn Swallow
- Bay-breasted Warbler
- Belcher's Gull
- Bendire's Thrasher
- Bewick's Wren
- Black-and-white Warbler
- Black-bellied Whistling Duck
- Black-billed Cuckoo
- Black-breasted Puffbird
- Black-capped Chickadee
- Black-capped Gnatcatcher
- Black-capped Vireo
- Black-chested Buzzard-Eagle
- Black-chinned Hummingbird
- Black-chinned Sparrow
- Black-crowned Night Heron
- Black-headed Grosbeak
- Black-headed Gull
- Black-necked Grebe
- Black-necked Stilt
- Black-striped Sparrow
- Black-tailed Gnatcatcher
- Black-throated Green Warbler
- Black-throated Grey Warbler
- Black-throated Sparrow
- Black Oystercatcher
- Black Phoebe
- Black Rosy Finch
- Black Skimmer
- Black Turnstone
- Black Vulture
- Blackburnian Warbler
- Blackpoll Warbler
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-headed Vireo
- Blue-winged Teal
- Blue-winged Warbler
- Blue Cotinga
- Blue Dacnis
- Blue Grosbeak
- Blue Jay
- Boat-tailed Grackle
- Bobolink
- Bonaparte's Gull
- Botteri's Sparrow
- Brewer's Blackbird
- Brewer's Sparrow
- Broad-billed Hummingbird
- Broad-tailed Hummingbird
- Broad-winged Hawk
- Bronzed Cowbird
- Brown-capped Rosy Finch
- Brown-crested Flycatcher
- Brown-headed Cowbird
- Brown-headed Nuthatch
- Brown Creeper
- Brown Jay
- Brown Pelican
- Brown Thrasher
- Buff-bellied Hummingbird
- Buff-breasted Sandpiper
- Buff-throated Saltator
- Bufflehead
- Burrowing Owl