- Baird's Sandpiper
- Bald Eagle
- Balearic Shearwater
- Baltimore Oriole
- Bananaquit
- Band-backed Wren
- Band-tailed Guan
- Band-tailed Pigeon
- Band-tailed Seedeater
- Band-tailed Sierra Finch
- Bar-tailed Godwit
- Bare-eyed Pigeon
- Bare-faced Ibis
- Bare-throated Tiger Heron
- Barn Swallow
- Barred Antshrike
- Barred Becard
- Barrow's Goldeneye
- Bat Falcon
- Bay-headed Tanager
- Bearded Barbet
- Bearded Reedling
- Bearded Vulture
- Beautiful Jay
- Beautiful Sunbird
- Belted Kingfisher
- Berthelot's Pipit
- Beryl-spangled Tanager
- Bewick's Wren
- Bicolored Wren
- Black-and-gold Tanager
- Black-and-white Owl
- Black-and-white Warbler
- Black-backed Antshrike
- Black-bellied Sandgrouse
- Black-bellied Whistling Duck
- Black-billed Thrush
- Black-capped Chickadee
- Black-capped Donacobius
- Black-capped Sparrow
- Black-capped Tanager
- Black-capped Tyrannulet
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Jay
- Black-chinned Mountain Tanager
- Black-collared Hawk
- Black-cowled Oriole
- Black-crested Bulbul
- Black-crowned Night Heron
- Black-faced Dacnis
- Black-faced Ibis
- Black-fronted Wood Quail
- Black-headed Gull
- Black-headed Lapwing
- Black-headed Parrot
- Black-headed Saltator
- Black-headed Siskin
- Black-headed Trogon
- Black-headed Weaver
- Black-hooded Thrush
- Black-legged Kittiwake
- Black-necked Aracari
- Black-necked Grebe
- Black-necked Stilt
- Black-rumped Waxbill
- Black-striped Sparrow
- Black-tailed Godwit
- Black-tailed Tityra
- Black-tailed Trainbearer
- Black-throated Accentor
- Black-throated Green Warbler
- Black-throated Laughingthrush
- Black-throated Loon
- Black-throated Mango
- Black-winged Ground Dove
- Black-winged Kite
- Black-winged Pratincole
- Black-winged Stilt
- Black Caracara
- Black Catbird
- Black Crake
- Black Crowned Crane
- Black Drongo
- Black Flowerpiercer
- Black Hawk-Eagle
- Black Heron
- Black Kite
- Black Lark
- Black Nunbird
- Black Phoebe
- Black Scrub Robin
- Black Stork
- Black Tern
- Black Vulture
- Black Woodpecker
- Blackburnian Warbler
- Blackish Nightjar
- Blossom-headed Parakeet
- Blue-and-black Tanager
- Blue-and-white Mockingbird
- Blue-and-white Swallow
- Blue-bellied Roller
- Blue-breasted Kingfisher
- Blue-capped Tanager
- Blue-cheeked Bee-eater
- Blue-footed Booby
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-headed Parrot
- Blue-naped Chlorophonia
- Blue-naped Mousebird
- Blue-necked Tanager
- Blue-spotted Wood Dove
- Blue-winged Mountain Tanager
- Blue-winged Parrotlet
- Blue Dacnis
- Blue Grosbeak
- Blue Jay
- Blue Rock Thrush
- Blue Whistling Thrush
- Bluethroat
- Boat-billed Flycatcher
- Boat-tailed Grackle
- Bohemian Waxwing
- Booted Warbler
- Brambling
- Brewer's Blackbird
- Broad-billed Motmot
- Broad-billed Roller
- Bronze-winged Parrot
- Bronzed Cowbird
- Brown-backed Chat-Tyrant
- Brown-capped Vireo
- Brown-chested Martin
- Brown-crested Flycatcher
- Brown-headed Gull
- Brown-throated Parakeet
- Brown-throated Wattle-eye
- Brown Babbler
- Brown Inca
- Brown Jay
- Brown Pelican
- Brown Thrasher
- Brown Violetear
- Bruce's Green Pigeon
- Buff-bellied Hummingbird
- Buff-breasted Wren
- Buff-tailed Coronet
- Buff-throated Saltator
- Bufflehead
- Bulwer's Petrel
- Burrowing Owl
- Bushy-crested Jay