- Baer's Pochard
- Baglafecht Weaver
- Baillon's Crake
- Baird's Sandpiper
- Balearic Shearwater
- Balicassiao
- Baltimore Oriole
- Bananaquit
- Band-backed Wren
- Band-tailed Antbird
- Band-tailed Earthcreeper
- Band-tailed Guan
- Band-tailed Pigeon
- Banded Bay Cuckoo
- Banded Kestrel
- Banded Lapwing
- Banded Martin
- Banded Stilt
- Banded Whiteface
- Banggai Fruit Dove
- Bank Cormorant
- Bank Myna
- Bar-backed Partridge
- Bar-bellied Cuckooshrike
- Bar-breasted Firefinch
- Bar-crested Antshrike
- Bar-headed Goose
- Bar-tailed Godwit
- Bar-throated Apalis
- Bar-throated Minla
- Bar-winged Wren-Babbler
- Bare-faced Curassow
- Bare-faced Ibis
- Barn Swallow
- Barnacle Goose
- Barratt's Warbler
- Barred Antshrike
- Barred Cuckoo-Dove
- Barred Hawk
- Barred Honey Buzzard
- Barred Owlet-nightjar
- Barred Puffbird
- Barred Warbler
- Bassian Thrush
- Bateleur
- Bay-backed Shrike
- Bay-breasted Warbler
- Bay-capped Wren-Spinetail
- Bay-headed Tanager
- Bay Coucal
- Bay Wren
- Baya Weaver
- Beach Kingfisher
- Bearded Scrub Robin
- Bearded Tachuri
- Bearded Vulture
- Bearded Woodpecker
- Beautiful Firetail
- Beautiful Fruit Dove
- Beautiful Nuthatch
- Beautiful Sibia
- Belford's Melidectes
- Bell Miner
- Beryl-spangled Tanager
- Bhutan Laughingthrush
- Biak Black Flycatcher
- Biak Fantail
- Biak Hooded Pitta
- Biak Paradise Kingfisher
- Biak Scops Owl
- Biak White-eye
- Bicolored Antbird
- Bicolored Antpitta
- Bicolored Wren
- Bimaculated Lark
- Bismarck Crow
- Black-and-chestnut Warbling Finch
- Black-and-cinnamon Fantail
- Black-and-red Broadbill
- Black-and-rufous Warbling Finch
- Black-and-white-casqued Hornbill
- Black-and-white Hawk-Eagle
- Black-and-white Mannikin
- Black-and-white Shrike-flycatcher
- Black-and-white Warbler
- Black-and-yellow Tanager
- Black-backed Bush Tanager
- Black-backed Butcherbird
- Black-backed Grosbeak
- Black-backed Puffback
- Black-backed Thornbill
- Black-backed Water Tyrant
- Black-banded Owl
- Black-banded Woodcreeper
- Black-bellied Bustard
- Black-bellied Cuckooshrike
- Black-bellied Sandgrouse
- Black-bellied Starling
- Black-bellied Whistling Duck
- Black-bellied Wren
- Black-billed Barbet
- Black-billed Coucal
- Black-billed Gull
- Black-billed Mountain Toucan
- Black-billed Nightingale-Thrush
- Black-billed Peppershrike
- Black-billed Thrush
- Black-billed Turaco
- Black-breasted Buzzard
- Black-breasted Puffbird
- Black-breasted Thrush
- Black-breasted Weaver
- Black-browed Triller
- Black-capped Flycatcher
- Black-capped Lory
- Black-capped Paradise Kingfisher
- Black-capped Pygmy Tyrant
- Black-capped Tanager
- Black-capped Warbling Finch
- Black-casqued Hornbill
- Black-cheeked Warbler
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Jay
- Black-chested Snake Eagle
- Black-chinned Fruit Dove
- Black-chinned Honeyeater
- Black-chinned Siskin
- Black-chinned Whistler
- Black-chinned Yuhina
- Black-collared Barbet
- Black-collared Hawk
- Black-crested Antshrike
- Black-crested Bulbul
- Black-crested Finch
- Black-crested Warbler
- Black-crowned Antshrike
- Black-crowned Monjita
- Black-crowned Night Heron
- Black-crowned Palm-tanager
- Black-crowned Sparrow-Lark
- Black-crowned Tchagra
- Black-crowned Tityra
- Black-crowned Waxbill
- Black-crowned White-eye
- Black-eared Cuckoo
- Black-eared Miner
- Black-faced Antthrush
- Black-faced Bunting
- Black-faced Cormorant
- Black-faced Cuckooshrike
- Black-faced Grassquit
- Black-faced Ibis
- Black-faced Laughingthrush
- Black-faced Monarch
- Black-faced Munia
- Black-faced Prinia
- Black-faced Warbler
- Black-faced Woodswallow
- Black-fronted Dotterel
- Black-fronted Nunbird
- Black-fronted Tern
- Black-fronted Wood Quail
- Black-headed Bulbul
- Black-headed Duck
- Black-headed Gonolek
- Black-headed Gull
- Black-headed Heron
- Black-headed Honeyeater
- Black-headed Ibis
- Black-headed Tody-Flycatcher
- Black-headed Weaver
- Black-headed Whistler
- Black-hooded Oriole
- Black-legged Kittiwake
- Black-lored Babbler
- Black-masked Finch
- Black-naped Fruit Dove
- Black-naped Monarch
- Black-naped Oriole
- Black-naped Tern
- Black-necked Grebe
- Black-necked Stilt
- Black-necked Stork
- Black-necked Swan
- Black-necked Weaver
- Black-rumped Flameback
- Black-rumped Waxbill
- Black-shouldered Kite
- Black-striped Woodcreeper
- Black-tailed Godwit
- Black-tailed Myiobius
- Black-tailed Nativehen
- Black-tailed Trogon
- Black-thighed Falconet
- Black-thighed Puffleg
- Black-throated Accentor
- Black-throated Apalis
- Black-throated Blue Warbler
- Black-throated Bushtit
- Black-throated Canary
- Black-throated Green Warbler
- Black-throated Huet-huet
- Black-throated Loon
- Black-throated Mango
- Black-throated Prinia
- Black-throated Saltator
- Black-throated Sunbird
- Black-throated Tody-Tyrant
- Black-whiskered Vireo
- Black-winged Cuckooshrike
- Black-winged Kite
- Black-winged Lapwing
- Black-winged Monarch
- Black-winged Pratincole
- Black-winged Stilt
- Black Antshrike
- Black Bee-eater
- Black Berrypecker
- Black Bishop
- Black Bittern
- Black Bulbul
- Black Butcherbird
- Black Cicadabird
- Black Crake
- Black Cuckoo
- Black Cuckooshrike
- Black Currawong
- Black Drongo
- Black Eagle
- Black Falcon
- Black Flowerpiercer
- Black Grouse
- Black Hawk-Eagle
- Black Heron
- Black Honeyeater
- Black Kite
- Black Lark
- Black Noddy
- Black Oropendola
- Black Petrel
- Black Phoebe
- Black Redstart
- Black Saw-wing
- Black Scrub Robin
- Black Sicklebill
- Black Skimmer
- Black Sparrowhawk
- Black Stilt
- Black Stork
- Black Sunbird
- Black Swan
- Black Tern
- Black Vulture
- Black Woodpecker
- Blackburnian Warbler
- Blackish Cuckooshrike
- Blackish Oystercatcher
- Blacksmith Lapwing
- Blackstart
- Blood Pheasant
- Blossom-headed Parakeet
- Blue-and-black Tanager
- Blue-and-white Kingfisher
- Blue-and-white Swallow
- Blue-and-yellow Tanager
- Blue-backed Conebill
- Blue-bearded Bee-eater
- Blue-billed Duck
- Blue-billed Teal
- Blue-black Grassquit
- Blue-black Grosbeak
- Blue-breasted Bee-eater
- Blue-breasted Fairywren
- Blue-breasted Kingfisher
- Blue-capped Fruit Dove
- Blue-capped Ifrit
- Blue-capped Redstart
- Blue-capped Tanager
- Blue-cheeked Bee-eater
- Blue-chested Hummingbird
- Blue-crowned Parakeet
- Blue-crowned Trogon
- Blue-eyed Cockatoo
- Blue-faced Honeyeater
- Blue-faced Parrotfinch
- Blue-footed Booby
- Blue-fronted Blue Flycatcher
- Blue-fronted Redstart
- Blue-grey Tanager
- Blue-headed Coucal
- Blue-headed Parrot
- Blue-headed Racket-tail
- Blue-mantled Crested Flycatcher
- Blue-mantled Thornbill
- Blue-naped Chlorophonia
- Blue-naped Mousebird
- Blue-naped Parrot
- Blue-necked Tanager
- Blue-tailed Bee-eater
- Blue-throated Barbet
- Blue-throated Blue Flycatcher
- Blue-throated Brown Sunbird
- Blue-throated Toucanet
- Blue-winged Goose
- Blue-winged Laughingthrush
- Blue-winged Leafbird
- Blue-winged Mountain Tanager
- Blue-winged Parakeet
- Blue-winged Parrot
- Blue-winged Teal
- Blue Cotinga
- Blue Coua
- Blue Crane
- Blue Dacnis
- Blue Duck
- Blue Korhaan
- Blue Malkoha
- Blue Manakin
- Blue Noddy
- Blue Paradise Flycatcher
- Blue Rock Thrush
- Blue Swallow
- Blue Whistling Thrush
- Bluethroat
- Bluish-grey Saltator
- Bluish Flowerpiercer
- Blyth's Hornbill
- Blyth's Leaf Warbler
- Blyth's Pipit
- Blyth's Reed Warbler
- Blyth's Swift
- Boat-billed Flycatcher
- Boat-billed Heron
- Bocage's Bushshrike
- Bohemian Waxwing
- Bokmakierie
- Booted Eagle
- Booted Warbler
- Boreal Owl
- Botha's Lark
- Boyer's Cuckooshrike
- Brahminy Kite
- Brahminy Starling
- Brambling
- Brant Goose
- Brazilian Teal
- Brehm's Tiger Parrot
- Bridled Tern
- Bright-rumped Attila
- Brimstone Canary
- Broad-billed Motmot
- Broad-billed Roller
- Broad-billed Sandpiper
- Broad-billed Tody
- Broad-winged Hawk
- Brolga
- Bronze-brown Cowbird
- Bronze-tailed Plumeleteer
- Bronze-winged Duck
- Bronze-winged Jacana
- Bronze Ground Dove
- Bronze Mannikin
- Bronzed Cowbird
- Bronzed Drongo
- Bronzy Inca
- Bronzy Sunbird
- Brooks's Leaf Warbler
- Brown-and-yellow Marshbird
- Brown-backed Chat-Tyrant
- Brown-backed Honeybird
- Brown-backed Honeyeater
- Brown-backed Needletail
- Brown-backed Scrub Robin
- Brown-banded Antpitta
- Brown-bellied Swallow
- Brown-capped Pygmy Woodpecker
- Brown-capped Tyrannulet
- Brown-capped Vireo
- Brown-capped Weaver
- Brown-capped Whitestart
- Brown-cheeked Bulbul
- Brown-cheeked Fulvetta
- Brown-cheeked Hornbill
- Brown-chested Lapwing
- Brown-chested Martin
- Brown-crowned Tchagra
- Brown-eared Woodpecker
- Brown-flanked Bush Warbler
- Brown-headed Barbet
- Brown-headed Crow
- Brown-headed Gull
- Brown-headed Honeyeater
- Brown-headed Paradise Kingfisher
- Brown-headed Parrot
- Brown-hooded Gull
- Brown-hooded Kingfisher
- Brown-hooded Parrot
- Brown-necked Raven
- Brown-throated Fulvetta
- Brown-throated Martin
- Brown-throated Parakeet
- Brown-throated Sunbird
- Brown-throated Wattle-eye
- Brown Accentor
- Brown Booby
- Brown Cacholote
- Brown Dipper
- Brown Falcon
- Brown Fish Owl
- Brown Goshawk
- Brown Honeyeater
- Brown Inca
- Brown Noddy
- Brown Oriole
- Brown Parrotbill
- Brown Pelican
- Brown Quail
- Brown Rock Chat
- Brown Scrub Robin
- Brown Shrike
- Brown Sicklebill
- Brown Skua
- Brown Snake Eagle
- Brown Songlark
- Brown Thornbill
- Brown Treecreeper
- Brown Violetear
- Brown Wood Owl
- Brubru
- Bruce's Green Pigeon
- Brush Bronzewing
- Brush Cuckoo
- Budgerigar
- Buff-banded Rail
- Buff-barred Warbler
- Buff-bellied Mannikin
- Buff-bellied Warbler
- Buff-breasted Mountain Tanager
- Buff-necked Ibis
- Buff-rumped Thornbill
- Buff-rumped Warbler
- Buff-spotted Woodpecker
- Buff-streaked Chat
- Buff-tailed Coronet
- Buff-throated Saltator
- Buff-throated Sunbird
- Buff-vented Bulbul
- Bufflehead
- Buffy Helmetcrest
- Buffy Tuftedcheek
- Bukidnon Woodcock
- Buller's Albatross
- Buller's Shearwater
- Bulwer's Petrel
- Burchell's Coucal
- Burchell's Starling
- Burnished-buff Tanager
- Burnt-necked Eremomela
- Burrowing Owl
- Burrowing Parrot
- Bush Blackcap
- Bush Stone-curlew
- Buzzing Flowerpecker