- Balearic Shearwater
- Baltimore Oriole
- Bananaquit
- Bank Cormorant
- Bar-bellied Woodpecker
- Bar-throated Apalis
- Bare-faced Ground Dove
- Bare-faced Ibis
- Bare-legged Owl
- Bare-throated Bellbird
- Bare-throated Tiger Heron
- Barn Swallow
- Barnacle Goose
- Barred Fruiteater
- Barred Warbler
- Barrow's Goldeneye
- Bat Falcon
- Bateleur
- Bay-headed Tanager
- Bay Wren
- Baya Weaver
- Bearded Guan
- Bearded Mountaineer
- Bearded Reedling
- Bearded Scrub Robin
- Bearded Vulture
- Bee Hummingbird
- Belcher's Gull
- Belted Kingfisher
- Berthelot's Pipit
- Beryl-spangled Tanager
- Black-and-white Hawk-Eagle
- Black-and-white Owl
- Black-and-white Warbler
- Black-backed Puffback
- Black-bellied Sandgrouse
- Black-bellied Starling
- Black-billed Shrike-Tyrant
- Black-billed Thrush
- Black-bodied Woodpecker
- Black-capped Donacobius
- Black-capped Foliage-gleaner
- Black-capped Warbling Finch
- Black-cheeked Gnateater
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Mountain Tanager
- Black-chested Prinia
- Black-collared Barbet
- Black-collared Starling
- Black-crested Bulbul
- Black-crested Coquette
- Black-crested Warbler
- Black-crowned Antshrike
- Black-crowned Night Heron
- Black-crowned Tchagra
- Black-eared Fairy
- Black-eared Warbler
- Black-faced Bunting
- Black-faced Grosbeak
- Black-faced Ibis
- Black-faced Solitaire
- Black-faced Tanager
- Black-faced Waxbill
- Black-fronted Nunbird
- Black-goggled Tanager
- Black-headed Bunting
- Black-headed Canary
- Black-headed Gull
- Black-headed Ibis
- Black-headed Oriole
- Black-hooded Antshrike
- Black-legged Dacnis
- Black-legged Kittiwake
- Black-necked Grebe
- Black-necked Stilt
- Black-rumped Flameback
- Black-streaked Scimitar Babbler
- Black-striped Sparrow
- Black-tailed Godwit
- Black-tailed Gull
- Black-tailed Trainbearer
- Black-tailed Trogon
- Black-throated Blue Warbler
- Black-throated Bushtit
- Black-throated Canary
- Black-throated Flowerpiercer
- Black-throated Green Warbler
- Black-throated Grosbeak
- Black-throated Laughingthrush
- Black-throated Loon
- Black-throated Mango
- Black-throated Thrush
- Black-throated Tody-Tyrant
- Black-winged Kite
- Black-winged Stilt
- Black Bittern
- Black Caracara
- Black Crake
- Black Drongo
- Black Flowerpiercer
- Black Grouse
- Black Guan
- Black Guillemot
- Black Jacobin
- Black Kite (govinda)
- Black Kite (lineatus)
- Black Phoebe
- Black Redstart
- Black Skimmer
- Black Stork
- Black Tern
- Black Vulture
- Black Wheatear
- Black Woodpecker
- Blackish Oystercatcher
- Blackish Rail
- Blacksmith Lapwing
- Blond-crested Woodpecker
- Blue-and-white Flycatcher
- Blue-and-white Swallow
- Blue-and-yellow Macaw
- Blue-and-yellow Tanager
- Blue-backed Conebill
- Blue-black Grassquit
- Blue-capped Tanager
- Blue-cheeked Bee-eater
- Blue-crowned Trogon
- Blue-footed Booby
- Blue-grey Tanager
- Blue-headed Macaw
- Blue-headed Parrot
- Blue-headed Quail-Dove
- Blue-mantled Thornbill
- Blue-necked Tanager
- Blue-tailed Bee-eater
- Blue-tailed Emerald
- Blue-throated Piping Guan
- Blue-throated Toucanet
- Blue-vented Hummingbird
- Blue-winged Mountain Tanager
- Blue-winged Teal
- Blue Dacnis
- Blue Rock Thrush
- Blue Waxbill
- Blue Whistling Thrush
- Bluish-grey Saltator
- Blyth's Leaf Warbler
- Boat-billed Heron
- Bohemian Waxwing
- Bokmakierie
- Bonelli's Eagle
- Bradfield's Swift
- Brahminy Kite
- Brahminy Starling
- Brambling
- Brazilian Ruby
- Brazilian Tanager
- Brazilian Teal
- Brimstone Canary
- Bronze-tailed Plumeleteer
- Bronze-winged Jacana
- Bronze-winged Parrot
- Bronzed Cowbird
- Brown-backed Chat-Tyrant
- Brown-breasted Bulbul
- Brown-chested Martin
- Brown-crowned Tchagra
- Brown-eared Bulbul
- Brown-flanked Bush Warbler
- Brown-headed Gull
- Brown-hooded Gull
- Brown-hooded Parrot
- Brown-throated Martin
- Brown-throated Sunbird
- Brown Booby
- Brown Cacholote
- Brown Crake
- Brown Inca
- Brown Jay
- Brown Pelican
- Brown Shrike
- Brown Snake Eagle
- Brown Violetear
- Brubru
- Buff-bellied Pipit
- Buff-breasted Earthcreeper (jelskii)
- Buff-fronted Foliage-gleaner
- Buff-necked Ibis
- Buff-rumped Warbler
- Buff-streaked Chat
- Buff-tailed Coronet
- Buff-throated Saltator
- Buff-throated Woodcreeper
- Buff-winged Starfrontlet
- Bull-headed Shrike
- Bulwer's Petrel
- Burchell's Coucal
- Burchell's Starling
- Burmese Shrike
- Burrowing Owl