- Baglafecht Weaver
- Bahama Warbler
- Baillon's Crake
- Baird's Flycatcher
- Baird's Sandpiper
- Bald Eagle
- Balearic Shearwater
- Bananaquit
- Band-tailed Manakin
- Band-tailed Sierra Finch
- Banded Martin
- Banded Stilt
- Banded Wren
- Bank Myna
- Bar-breasted Honeyeater
- Bar-headed Goose
- Bar-shouldered Dove
- Bar-tailed Godwit
- Bar-tailed Lark
- Bare-faced Curassow
- Bare-faced Go-away-bird
- Bare-faced Ground Dove
- Bare-faced Ibis
- Bare-throated Tiger Heron
- Barking Owl
- Barn Swallow
- Barnacle Goose
- Barred Antshrike
- Barred Dove
- Barred Honeyeater
- Barrow's Goldeneye
- Bateleur
- Bearded Reedling
- Bearded Woodpecker
- Belcher's Gull
- Berthelot's Pipit
- Bewick's Wren
- Black-and-rufous Warbling Finch
- Black-and-white Hawk-Eagle
- Black-and-white Warbler
- Black-backed Grosbeak
- Black-backed Puffback
- Black-bellied Bustard
- Black-bellied Sunbird
- Black-bellied Whistling Duck
- Black-billed Gull
- Black-billed Shrike-Tyrant
- Black-capped Donacobius
- Black-capped Kingfisher
- Black-capped Social Weaver
- Black-capped Speirops
- Black-capped Tanager
- Black-cheeked Waxbill
- Black-chested Prinia
- Black-chested Snake Eagle
- Black-collared Hawk
- Black-crested Antshrike
- Black-crested Titmouse
- Black-crowned Antshrike
- Black-crowned Sparrow-Lark
- Black-crowned Tityra
- Black-faced Babbler
- Black-faced Cuckooshrike
- Black-faced Grassquit
- Black-faced Munia
- Black-faced Sandgrouse
- Black-faced Solitaire
- Black-faced Woodswallow
- Black-fronted Dotterel
- Black-fronted Nunbird
- Black-fronted Piping Guan
- Black-headed Apalis
- Black-headed Grosbeak
- Black-headed Gull
- Black-headed Heron
- Black-headed Ibis
- Black-headed Saltator
- Black-headed Trogon
- Black-hooded Oriole
- Black-hooded Sierra Finch
- Black-legged Kittiwake
- Black-lored Babbler
- Black-naped Monarch
- Black-naped Oriole
- Black-necked Grebe
- Black-necked Stilt
- Black-necked Stilt (knudseni)
- Black-necked Stork
- Black-necked Swan
- Black-rumped Flameback
- Black-spotted Barbet
- Black-tailed Godwit
- Black-tailed Gull
- Black-tailed Nativehen
- Black-tailed Trainbearer
- Black-throated Barbet
- Black-throated Blue Warbler
- Black-throated Flowerpiercer
- Black-throated Saltator
- Black-throated Thrush
- Black-vented Oriole
- Black-whiskered Vireo
- Black-winged Kite
- Black-winged Lapwing
- Black-winged Saltator
- Black-winged Stilt
- Black Bishop
- Black Caracara
- Black Crake
- Black Drongo
- Black Eagle
- Black Flowerpiercer
- Black Guan
- Black Guillemot
- Black Kite
- Black Kite (lineatus)
- Black Noddy
- Black Oystercatcher
- Black Phoebe
- Black Redstart
- Black Siskin
- Black Skimmer
- Black Stork
- Black Swan
- Black Turnstone
- Black Vulture
- Blackish Oystercatcher
- Blackish Rail
- Blackpoll Warbler
- Blacksmith Lapwing
- Blackstart
- Blue-and-white Swallow
- Blue-and-yellow Macaw
- Blue-and-yellow Tanager
- Blue-backed Manakin
- Blue-billed Black Tyrant
- Blue-billed Duck
- Blue-billed Teal
- Blue-black Grassquit
- Blue-breasted Bee-eater
- Blue-capped Rock Thrush
- Blue-cheeked Bee-eater
- Blue-crowned Parakeet
- Blue-crowned Trogon
- Blue-faced Honeyeater
- Blue-footed Booby
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-headed Hummingbird
- Blue-headed Parrot
- Blue-headed Vireo
- Blue-naped Mousebird
- Blue-necked Tanager
- Blue-tailed Bee-eater
- Blue-throated Toucanet
- Blue-winged Kookaburra
- Blue-winged Mountain Tanager
- Blue-winged Teal
- Blue Dacnis
- Blue Grosbeak
- Blue Ground Dove
- Blue Manakin
- Blue Rock Thrush
- Blue Waxbill
- Bluethroat
- Bluish-fronted Jacamar
- Blyth's Reed Warbler
- Boat-billed Flycatcher
- Boat-billed Heron
- Boat-tailed Grackle
- Bohemian Waxwing
- Bolivian Blackbird
- Bolivian Earthcreeper
- Bolivian Slaty Antshrike
- Bolle's Pigeon
- Bradfield's Hornbill
- Bradfield's Swift
- Brahminy Kite
- Brahminy Starling
- Brambling
- Brandt's Cormorant
- Brant Goose
- Brazilian Merganser
- Brazilian Tanager
- Brazilian Teal
- Brewer's Blackbird
- Bridled Honeyeater
- Bridled Tern
- Bright-rumped Yellow Finch
- Bristle-crowned Starling
- Broad-billed Hummingbird
- Broad-billed Motmot
- Broad-winged Hawk
- Brolga
- Bronze-winged Jacana
- Bronze Mannikin
- Bronze Sunbird
- Bronzed Cowbird
- Brown-backed Mockingbird
- Brown-bellied Swallow
- Brown-breasted Flycatcher
- Brown-crested Flycatcher
- Brown-crowned Tchagra
- Brown-eared Bulbul
- Brown-headed Barbet
- Brown-headed Cowbird
- Brown-headed Parrot
- Brown-hooded Kingfisher
- Brown-necked Raven
- Brown-throated Parakeet
- Brown-throated Sunbird
- Brown-throated Wattle-eye
- Brown Babbler
- Brown Boobook
- Brown Booby
- Brown Cacholote
- Brown Creeper
- Brown Dipper
- Brown Falcon
- Brown Fish Owl
- Brown Gerygone
- Brown Goshawk
- Brown Honeyeater
- Brown Inca
- Brown Noddy
- Brown Pelican
- Brown Rock Chat
- Brown Shrike
- Brown Snake Eagle
- Brown Teal
- Brown Trembler
- Brushland Tinamou
- Buff-banded Rail
- Buff-crested Bustard
- Buff-throated Saltator
- Buff-winged Cinclodes
- Buller's Shearwater
- Burchell's Coucal
- Burchell's Starling
- Burnt-necked Eremomela
- Burrowing Owl
- Burrowing Parrot
- Bush Stone-curlew
- Bushy-crested Jay