- Bald Eagle
- Baltimore Oriole
- Banded Wren
- Bare-throated Tiger Heron
- Barn Swallow
- Barred Antshrike
- Barred Owl
- Barrow's Goldeneye
- Bat Falcon
- Belted Kingfisher
- Bewick's Wren
- Black-and-white Warbler
- Black-backed Woodpecker
- Black-bellied Whistling Duck
- Black-billed Magpie
- Black-billed Nightingale-Thrush
- Black-capped Chickadee
- Black-cheeked Warbler
- Black-cheeked Woodpecker
- Black-chinned Hummingbird
- Black-crowned Night Heron
- Black-headed Grosbeak
- Black-headed Trogon
- Black-legged Kittiwake
- Black-necked Stilt
- Black-throated Blue Warbler
- Black-throated Green Warbler
- Black-throated Sparrow
- Black Guillemot
- Black Phoebe
- Black Skimmer
- Black Tern
- Black Vulture
- Blackburnian Warbler
- Blackpoll Warbler
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-winged Teal
- Blue Jay
- Boat-billed Heron
- Boat-tailed Grackle
- Bobolink
- Bohemian Waxwing
- Bonaparte's Gull
- Boreal Chickadee
- Brant Goose
- Brewer's Blackbird
- Brewer's Sparrow
- Broad-tailed Hummingbird
- Bronzed Cowbird
- Brown-crested Flycatcher
- Brown-headed Cowbird
- Brown Creeper
- Brown Jay
- Brown Pelican
- Brown Thrasher
- Buff-bellied Pipit
- Buff-throated Saltator
- Bufflehead
- Bullock's Oriole
- Burrowing Owl