- Baglafecht Weaver
- Baikal Bush Warbler
- Baikal Teal
- Baillon's Crake
- Baliem Whistler
- Bananaquit
- Band-backed Wren
- Band-tailed Hornero
- Band-tailed Pigeon
- Band-tailed Seedeater
- Band-tailed Sierra Finch
- Banda Myzomela
- Banded Broadbill
- Banded Fruit Dove
- Banded Honeyeater
- Banded Kingfisher
- Banded Lapwing
- Banded Prinia
- Banded Stilt
- Banded Wren
- Bar-headed Goose
- Bar-shouldered Dove
- Bar-tailed Cuckoo-Dove
- Bar-tailed Godwit
- Bar-throated Apalis
- Bar-throated Minla
- Bar-winged Flycatcher-shrike
- Bar-winged Oriole
- Bar-winged Wood Wren
- Bar-winged Wren-Babbler
- Bare-cheeked Babbler
- Bare-faced Go-away-bird
- Bare-faced Ground Dove
- Bare-throated Tiger Heron
- Bare-throated Whistler
- Barking Owl
- Barn Swallow
- Barred Antshrike
- Barred Becard
- Barred Buttonquail
- Barred Cuckoo-Dove
- Barred Cuckooshrike
- Barred Dove
- Barred Fruiteater
- Barred Rail
- Barred Wren-Warbler
- Bassian Thrush
- Bat Falcon
- Bat Hawk
- Bateleur
- Bates's Sunbird
- Bay-backed Shrike
- Bay-chested Warbling Finch
- Bay-headed Tanager
- Bay Coucal
- Baya Weaver
- Beach Kingfisher
- Beach Stone-curlew
- Bearded Barbet
- Bearded Scrub Robin
- Bearded Vulture
- Bearded Woodpecker
- Beautiful Firetail
- Beautiful Nuthatch
- Beautiful Sheartail
- Beautiful Sibia
- Beautiful Sunbird
- Belcher's Gull
- Belford's Melidectes
- Belted Flycatcher
- Benguela Long-billed Lark
- Bernier's Teal
- Bertoni's Antbird
- Beryl-spangled Tanager
- Berylline Hummingbird
- Besra
- Bewick's Wren
- Bhutan Laughingthrush
- Biak Black Flycatcher
- Biak Gerygone
- Biak Monarch
- Biak Paradise Kingfisher
- Biak Scops Owl
- Biak White-eye
- Bicolored Antbird
- Black-and-gold Cotinga
- Black-and-orange Flycatcher
- Black-and-red Broadbill
- Black-and-rufous Warbling Finch
- Black-and-white Becard
- Black-and-white Mannikin
- Black-and-white Shrike-flycatcher
- Black-and-white Warbler
- Black-and-yellow Broadbill
- Black-backed Butcherbird
- Black-backed Forktail
- Black-backed Grosbeak
- Black-backed Puffback
- Black-backed Water Tyrant
- Black-banded Flycatcher
- Black-banded Woodcreeper
- Black-bellied Bustard
- Black-bellied Seedcracker
- Black-bellied Starling
- Black-bellied Whistling Duck
- Black-billed Barbet
- Black-billed Coucal
- Black-billed Koel
- Black-billed Peppershrike
- Black-billed Scythebill
- Black-billed Seed Finch
- Black-billed Thrush
- Black-billed Wood Dove
- Black-billed Wood Hoopoe
- Black-breasted Boatbill
- Black-breasted Myzomela
- Black-breasted Thrush
- Black-breasted Wood Quail
- Black-browed Albatross
- Black-browed Triller
- Black-capped Donacobius
- Black-capped Foliage-gleaner
- Black-capped Lory
- Black-capped Pygmy Tyrant
- Black-capped Social Weaver
- Black-capped Speirops
- Black-capped Swallow
- Black-casqued Hornbill
- Black-cheeked Ant Tanager
- Black-cheeked Gnateater
- Black-cheeked Waxbill
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Prinia
- Black-chested Snake Eagle
- Black-chinned Honeyeater
- Black-chinned Mountain Tanager
- Black-chinned Siskin
- Black-chinned Weaver
- Black-chinned Whistler
- Black-chinned Yuhina
- Black-collared Barbet
- Black-collared Bulbul
- Black-collared Hawk
- Black-crested Antshrike
- Black-crested Bulbul
- Black-crested Tit-Tyrant
- Black-crowned Night Heron
- Black-crowned Sparrow-Lark
- Black-crowned Tchagra
- Black-crowned Tityra
- Black-crowned White-eye
- Black-eared Seedeater
- Black-eared Shrike-babbler
- Black-eared Warbler
- Black-faced Antthrush
- Black-faced Bunting
- Black-faced Canary
- Black-faced Cuckooshrike
- Black-faced Firefinch
- Black-faced Grosbeak
- Black-faced Laughingthrush
- Black-faced Monarch
- Black-faced Munia
- Black-faced Warbler
- Black-faced Waxbill
- Black-faced Woodswallow
- Black-fronted Bushshrike
- Black-fronted Dotterel
- Black-fronted Flowerpecker
- Black-fronted Nunbird
- Black-fronted Piping Guan
- Black-goggled Tanager
- Black-headed Bulbul
- Black-headed Bunting
- Black-headed Cuckooshrike
- Black-headed Grosbeak
- Black-headed Gull
- Black-headed Heron
- Black-headed Honeyeater
- Black-headed Ibis
- Black-headed Lapwing
- Black-headed Oriole
- Black-headed Saltator
- Black-headed Shrike-babbler
- Black-headed Trogon
- Black-headed Waxbill
- Black-hooded Antshrike
- Black-hooded Oriole
- Black-hooded Sierra Finch
- Black-legged Kittiwake
- Black-naped Fruit Dove
- Black-naped Monarch
- Black-naped Oriole
- Black-naped Tern
- Black-necked Aracari
- Black-necked Eremomela
- Black-necked Stilt
- Black-necked Stork
- Black-necked Weaver
- Black-necked Woodpecker
- Black-ringed White-eye
- Black-rumped Flameback
- Black-rumped Waxbill
- Black-shouldered Kite
- Black-shouldered Nightjar
- Black-sided Robin
- Black-striped Sparrow
- Black-striped Woodcreeper
- Black-tailed Crake
- Black-tailed Godwit
- Black-tailed Nativehen
- Black-tailed Tityra
- Black-tailed Treecreeper
- Black-throated Apalis
- Black-throated Babbler
- Black-throated Barbet
- Black-throated Brilliant
- Black-throated Bushtit
- Black-throated Canary
- Black-throated Finch
- Black-throated Green Warbler
- Black-throated Grey Warbler
- Black-throated Loon
- Black-throated Mango
- Black-throated Parrotbill
- Black-throated Prinia
- Black-throated Robin
- Black-throated Saltator
- Black-throated Sunbird
- Black-throated Thrush
- Black-throated Tody-Tyrant
- Black-throated Toucanet
- Black-throated Trogon
- Black-throated Wattle-eye
- Black-vented Oriole
- Black-vented Shearwater
- Black-winged Cuckooshrike
- Black-winged Flycatcher-shrike
- Black-winged Kite
- Black-winged Lory
- Black-winged Lovebird
- Black-winged Monarch
- Black-winged Oriole
- Black-winged Red Bishop
- Black-winged Stilt
- Black Baza
- Black Bee-eater
- Black Bittern
- Black Bulbul
- Black Butcherbird
- Black Caracara
- Black Catbird
- Black Cicadabird
- Black Crake
- Black Crowned Crane
- Black Cuckoo-Dove
- Black Cuckooshrike
- Black Currawong
- Black Drongo
- Black Eagle
- Black Grouse
- Black Guillemot
- Black Guineafowl
- Black Heron
- Black Honeyeater
- Black Hornbill
- Black Jacobin
- Black Kite
- Black Noddy
- Black Nunbird
- Black Phoebe
- Black Redstart
- Black Saw-wing
- Black Scrub Robin
- Black Sicklebill
- Black Skimmer
- Black Sparrowhawk
- Black Stork
- Black Storm Petrel
- Black Sunbird
- Black Swan
- Black Tern
- Black Vulture
- Black Woodpecker
- Blackburnian Warbler
- Blackcap Babbler
- Blackish Antbird
- Blackish Oystercatcher
- Blacksmith Lapwing
- Blackstart
- Blanford's Lark
- Blood-breasted Flowerpecker
- Blood-colored Woodpecker
- Blue-and-white Kingfisher
- Blue-and-white Swallow
- Blue-and-yellow Tanager
- Blue-banded Toucanet
- Blue-bearded Bee-eater
- Blue-bellied Roller
- Blue-billed Black Tyrant
- Blue-billed Malimbe
- Blue-black Grassquit
- Blue-black Grosbeak
- Blue-breasted Bee-eater
- Blue-breasted Kingfisher
- Blue-capped Fruit Dove
- Blue-capped Rock Thrush
- Blue-capped Tanager
- Blue-cheeked Bee-eater
- Blue-cheeked Flowerpecker
- Blue-chested Hummingbird
- Blue-crowned Chlorophonia
- Blue-crowned Trogon
- Blue-eared Kingfisher
- Blue-faced Honeyeater
- Blue-footed Booby
- Blue-fronted Blue Flycatcher
- Blue-fronted Lancebill
- Blue-fronted Redstart
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-headed Coucal
- Blue-headed Crested Flycatcher
- Blue-headed Fantail
- Blue-headed Parrot
- Blue-headed Vireo
- Blue-moustached Bee-eater
- Blue-naped Chlorophonia
- Blue-naped Mousebird
- Blue-spotted Wood Dove
- Blue-tailed Bee-eater
- Blue-throated Barbet
- Blue-throated Bee-eater
- Blue-throated Blue Flycatcher
- Blue-throated Brown Sunbird
- Blue-throated Mountaingem
- Blue-throated Piping Guan
- Blue-throated Roller
- Blue-winged Goose
- Blue-winged Kookaburra
- Blue-winged Laughingthrush
- Blue-winged Minla
- Blue-winged Mountain Tanager
- Blue-winged Parakeet
- Blue-winged Parrot
- Blue-winged Parrotlet
- Blue-winged Pitta
- Blue-winged Teal
- Blue Dacnis
- Blue Ground Dove
- Blue Malkoha
- Blue Manakin
- Blue Rock Thrush
- Blue Vanga
- Blue Waxbill
- Blue Whistling Thrush
- Bluethroat
- Bluish Flowerpiercer
- Blyth's Frogmouth
- Blyth's Hornbill
- Blyth's Leaf Warbler
- Blyth's Paradise Flycatcher
- Blyth's Pipit
- Blyth's Reed Warbler
- Blyth's Shrike-babbler
- Boat-billed Flycatcher
- Boat-billed Heron
- Bocage's Akalat
- Bocage's Bushshrike
- Bohemian Waxwing
- Böhm's Spinetail
- Bokmakierie
- Bolivian Warbling Finch
- Booted Eagle
- Boran Cisticola
- Boreal Owl
- Bornean Green Magpie
- Bornean Whistler
- Boucard's Wren
- Boulder Chat
- Boyer's Cuckooshrike
- Brahminy Kite
- Brahminy Starling
- Brambling
- Bran-colored Flycatcher
- Brandt's Mountain Finch
- Brassy-breasted Tanager
- Braun's Bushshrike
- Brazilian Ruby
- Brazilian Tanager
- Brazilian Teal
- Bridled Honeyeater
- Bridled Sparrow
- Bridled Tern
- Bright-rumped Attila
- Bright-rumped Yellow Finch
- Brimstone Canary
- Bristle-nosed Barbet
- Broad-billed Flycatcher
- Broad-billed Roller
- Broad-billed Warbler
- Broad-tailed Paradise Whydah
- Broad-winged Hawk
- Brolga
- Bronze-tailed Starling
- Bronze-winged Jacana
- Bronze-winged Parrot
- Bronze Mannikin
- Bronzed Drongo
- Bronzy Inca
- Bronzy Sunbird
- Brown-backed Chat-Tyrant
- Brown-backed Honeyeater
- Brown-backed Scrub Robin
- Brown-backed Solitaire
- Brown-breasted Barbet
- Brown-breasted Flycatcher
- Brown-breasted Gerygone
- Brown-capped Fantail
- Brown-capped Pygmy Woodpecker
- Brown-cheeked Fulvetta
- Brown-cheeked Hornbill
- Brown-chested Martin
- Brown-crested Flycatcher
- Brown-eared Woodpecker
- Brown-flanked Bush Warbler
- Brown-headed Barbet
- Brown-headed Honeyeater
- Brown-headed Parrot
- Brown-hooded Kingfisher
- Brown-necked Raven
- Brown-rumped Bunting
- Brown-rumped Seedeater
- Brown-throated Fulvetta
- Brown-throated Sunbird
- Brown-throated Wattle-eye
- Brown-winged Kingfisher
- Brown Babbler
- Brown Booby
- Brown Creeper
- Brown Cuckoo-Dove
- Brown Dipper
- Brown Falcon
- Brown Firefinch
- Brown Fish Owl
- Brown Fulvetta
- Brown Goshawk
- Brown Hawk-Owl
- Brown Honeyeater
- Brown Inca
- Brown Jay
- Brown Noddy
- Brown Oriole
- Brown Parrotbill
- Brown Pelican
- Brown Quail
- Brown Shrike
- Brown Skua
- Brown Snake Eagle
- Brown Songlark
- Brown Thornbill
- Brown Treecreeper
- Brown Violetear
- Brubru
- Bruce's Green Pigeon
- Brush Cuckoo
- Bubbling Cisticola
- Budgerigar
- Buff-banded Rail
- Buff-barred Warbler
- Buff-bellied Hummingbird
- Buff-breasted Wren
- Buff-bridled Inca Finch
- Buff-collared Nightjar
- Buff-crested Bustard
- Buff-faced Pygmy Parrot
- Buff-fronted Foliage-gleaner
- Buff-necked Ibis
- Buff-rumped Thornbill
- Buff-rumped Woodpecker
- Buff-sided Robin
- Buff-tailed Coronet
- Buff-throated Apalis
- Buff-throated Foliage-gleaner
- Buff-throated Saltator
- Buff-throated Sunbird
- Buff-vented Bulbul
- Buff-winged Starfrontlet
- Buffy Pipit
- Bugun Liocichla
- Bullock's Oriole
- Bumblebee Hummingbird
- Burchell's Starling
- Burnished-buff Tanager
- Burrowing Owl
- Bush Stone-curlew
- Bushy-crested Hornbill