- Baglafecht Weaver
- Bahia Antwren
- Bahia Spinetail
- Bahia Tyrannulet
- Baillon's Crake
- Baird's Sandpiper
- Bald Eagle
- Balearic Warbler
- Bali Myna
- Bamboo Antshrike
- Bamenda Apalis
- Bananaquit
- Band-tailed Antbird
- Band-tailed Antwren
- Band-tailed Manakin
- Band-tailed Nighthawk
- Band-winged Nightjar
- Banded Barbet
- Banded Broadbill
- Banded Fruit Dove
- Banded Kestrel
- Banded Kingfisher
- Banded Martin
- Banded Parisoma
- Banded Prinia
- Banded Stilt
- Banded Wattle-eye
- Bangwa Forest Warbler
- Bank Myna
- Bannerman's Turaco
- Bannerman's Weaver
- Bar-bellied Pitta
- Bar-bellied Woodpecker
- Bar-breasted Firefinch
- Bar-crested Antshrike
- Bar-headed Goose
- Bar-shouldered Dove
- Bar-tailed Cuckoo-Dove
- Bar-tailed Godwit
- Bar-tailed Lark
- Bar-tailed Treecreeper
- Bar-tailed Trogon
- Bar-winged Flycatcher-shrike
- Bar-winged Prinia
- Bare-cheeked Babbler
- Bare-cheeked Trogon
- Bare-eyed Thrush
- Bare-eyed White-eye
- Bare-faced Go-away-bird
- Bare-throated Bellbird
- Bare-throated Whistler
- Barking Imperial Pigeon
- Barn Swallow
- Barnacle Goose
- Barred Antshrike
- Barred Becard
- Barred Cuckooshrike
- Barred Dove
- Barred Fruiteater
- Barred Honeyeater
- Barred Owlet-nightjar
- Barred Warbler
- Barrow's Goldeneye
- Bassian Thrush
- Bat Falcon
- Bat Hawk
- Bateleur
- Bates's Swift
- Bay-backed Shrike
- Bay-headed Tanager
- Baya Weaver
- Beach Kingfisher
- Beach Stone-curlew
- Bearded Bellbird
- Bearded Guan
- Bearded Mountaineer
- Bearded Reedling
- Bearded Vulture
- Bearded Woodpecker
- Beautiful Fruit Dove
- Beautiful Sibia
- Beautiful Sunbird
- Belford's Melidectes
- Bell's Vireo
- Belted Kingfisher
- Berthelot's Pipit
- Bewick's Wren
- Biak Black Flycatcher
- Biak Coucal
- Biak Lorikeet
- Biak Monarch
- Biak Paradise Kingfisher
- Biak Scrubfowl
- Biak White-eye
- Bicolored Antbird
- Bicolored Conebill
- Bicolored Hawk
- Bicolored Wren
- Bimaculated Lark
- Biscutate Swift
- Bismarck Black Myzomela
- Bismarck Crow
- Bismarck Hanging Parrot
- Bismarck Whistler
- Bismarck White-eye
- Black-and-buff Woodpecker
- Black-and-chestnut Eagle
- Black-and-red Broadbill
- Black-and-white-casqued Hornbill
- Black-and-white Hawk-Eagle
- Black-and-white Mannikin
- Black-and-white Shrike-flycatcher
- Black-and-yellow Broadbill
- Black-backed Antshrike
- Black-backed Barbet
- Black-backed Butcherbird
- Black-backed Forktail
- Black-backed Puffback
- Black-backed Tody-Flycatcher
- Black-backed Woodpecker
- Black-banded Barbet
- Black-banded Flycatcher
- Black-banded Woodcreeper
- Black-bellied Antwren
- Black-bellied Bustard
- Black-bellied Cuckoo
- Black-bellied Cuckooshrike
- Black-bellied Firefinch
- Black-bellied Sandgrouse
- Black-bellied Seedcracker
- Black-bellied Starling
- Black-bellied Sunbird
- Black-bellied Tern
- Black-bellied Whistling Duck
- Black-billed Barbet
- Black-billed Coucal
- Black-billed Gull
- Black-billed Magpie
- Black-billed Mountain Toucan
- Black-billed Scythebill
- Black-billed Seed Finch
- Black-billed Thrush
- Black-billed Turaco
- Black-billed Weaver
- Black-billed Wood Dove
- Black-billed Wood Hoopoe
- Black-breasted Boatbill
- Black-breasted Myzomela
- Black-breasted Weaver
- Black-browed Albatross
- Black-browed Reed Warbler
- Black-capped Antwren
- Black-capped Chickadee
- Black-capped Donacobius
- Black-capped Foliage-gleaner
- Black-capped Hemispingus
- Black-capped Kingfisher
- Black-capped Lory
- Black-capped Social Weaver
- Black-capped Sparrow
- Black-capped Speirops
- Black-casqued Hornbill
- Black-cheeked Gnateater
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Fruiteater
- Black-chested Jay
- Black-chested Mountain Tanager
- Black-chested Prinia
- Black-chested Snake Eagle
- Black-chinned Babbler
- Black-chinned Hummingbird
- Black-chinned Mountain Tanager
- Black-chinned Siskin
- Black-chinned Sparrow
- Black-chinned Weaver
- Black-chinned Yuhina
- Black-collared Apalis
- Black-collared Barbet
- Black-collared Starling
- Black-cowled Saltator
- Black-crested Antshrike
- Black-crested Bulbul
- Black-crested Titmouse
- Black-crested Warbler
- Black-crowned Night Heron
- Black-crowned Sparrow-Lark
- Black-crowned Tchagra
- Black-crowned Waxbill
- Black-eared Fairy
- Black-eared Wheatear
- Black-faced Antbird
- Black-faced Canary
- Black-faced Cormorant
- Black-faced Ibis
- Black-faced Munia
- Black-faced Pitta
- Black-faced Rufous Warbler
- Black-faced Sandgrouse
- Black-faced Spoonbill
- Black-faced Tanager
- Black-faced Woodswallow
- Black-footed Albatross
- Black-fronted Bushshrike
- Black-fronted Flowerpecker
- Black-fronted Nunbird
- Black-fronted Tern
- Black-fronted White-eye
- Black-headed Apalis
- Black-headed Bulbul
- Black-headed Bunting
- Black-headed Duck
- Black-headed Gonolek
- Black-headed Grosbeak
- Black-headed Gull
- Black-headed Heron
- Black-headed Ibis
- Black-headed Jay
- Black-headed Lapwing
- Black-headed Myzomela
- Black-headed Oriole
- Black-headed Woodpecker
- Black-hooded Oriole
- Black-hooded Thrush
- Black-legged Kittiwake
- Black-lored Yellowthroat
- Black-mantled Goshawk
- Black-naped Fruit Dove
- Black-naped Monarch
- Black-naped Oriole
- Black-naped Tern
- Black-necked Aracari
- Black-necked Crane
- Black-necked Grebe
- Black-necked Swan
- Black-necklaced Scimitar Babbler
- Black-rumped Flameback
- Black-shouldered Kite
- Black-sided Robin
- Black-streaked Puffbird
- Black-streaked Scimitar Babbler
- Black-striped Sparrow
- Black-striped Woodcreeper
- Black-tailed Godwit
- Black-tailed Gull
- Black-tailed Monarch
- Black-tailed Nativehen
- Black-tailed Trainbearer
- Black-tailed Trogon
- Black-thighed Falconet
- Black-throated Apalis
- Black-throated Babbler
- Black-throated Barbet
- Black-throated Coucal
- Black-throated Flowerpiercer
- Black-throated Grey Warbler
- Black-throated Honeyeater
- Black-throated Loon
- Black-throated Mango
- Black-throated Robin
- Black-throated Shrikebill
- Black-throated Sparrow
- Black-throated Thrush
- Black-throated Tody-Tyrant
- Black-throated Toucanet
- Black-throated Trogon
- Black-throated Wattle-eye
- Black-winged Flycatcher-shrike
- Black-winged Kite
- Black-winged Lapwing
- Black-winged Lory
- Black-winged Lovebird
- Black-winged Monarch
- Black-winged Red Bishop
- Black-winged Saltator
- Black-winged Snowfinch
- Black-winged Stilt
- Black Bee-eater
- Black Bulbul
- Black Caracara
- Black Cicadabird
- Black Crake
- Black Crowned Crane
- Black Cuckoo
- Black Cuckoo-Dove
- Black Cuckooshrike
- Black Drongo
- Black Dwarf Hornbill
- Black Eagle
- Black Francolin
- Black Grouse
- Black Guillemot
- Black Hawk-Eagle
- Black Imperial Pigeon
- Black Inca
- Black Jacobin
- Black Kite
- Black Noddy
- Black Nunbird
- Black Petrel
- Black Phoebe
- Black Redstart
- Black Saw-wing
- Black Scimitarbill
- Black Scoter
- Black Scrub Robin
- Black Sicklebill
- Black Siskin
- Black Sittella
- Black Skimmer
- Black Sparrowhawk
- Black Stilt
- Black Stork
- Black Sunbird
- Black Swan
- Black Tern
- Black Turnstone
- Black Vulture
- Black Wheatear
- Black Woodpecker
- Blackburnian Warbler
- Blackcap Illadopsis
- Blackish-headed Spinetail
- Blackish Nightjar
- Blackish Oystercatcher
- Blackpoll Warbler
- Blacksmith Lapwing
- Blakiston's Fish Owl
- Blanford's Lark
- Blanford's Snowfinch
- Blood-eared Parakeet
- Blossom-headed Parakeet
- Blue-and-black Tanager
- Blue-and-white Flycatcher
- Blue-and-yellow Macaw
- Blue-backed Conebill
- Blue-backed Manakin
- Blue-bearded Bee-eater
- Blue-bellied Roller
- Blue-billed Malimbe
- Blue-black Grassquit
- Blue-breasted Kingfisher
- Blue-capped Cordon-bleu
- Blue-capped Redstart
- Blue-cheeked Amazon
- Blue-cheeked Bee-eater
- Blue-cheeked Flowerpecker
- Blue-chested Hummingbird
- Blue-crowned Lorikeet
- Blue-crowned Manakin
- Blue-eared Barbet
- Blue-footed Booby
- Blue-fronted Parrotlet
- Blue-fronted Redstart
- Blue-grey Tanager
- Blue-headed Bee-eater
- Blue-headed Coucal
- Blue-headed Crested Flycatcher
- Blue-headed Parrot
- Blue-headed Wood Dove
- Blue-mantled Thornbill
- Blue-moustached Bee-eater
- Blue-naped Mousebird
- Blue-necked Tanager
- Blue-rumped Pitta
- Blue-spotted Wood Dove
- Blue-tailed Bee-eater
- Blue-tailed Emerald
- Blue-throated Barbet
- Blue-throated Bee-eater
- Blue-throated Mountaingem
- Blue-throated Piping Guan
- Blue-throated Roller
- Blue-throated Starfrontlet
- Blue-winged Goose
- Blue-winged Kookaburra
- Blue-winged Leafbird
- Blue-winged Minla
- Blue-winged Mountain Tanager
- Blue-winged Parrotlet
- Blue Cuckooshrike
- Blue Dacnis
- Blue Duck
- Blue Grosbeak
- Blue Ground Dove
- Blue Malkoha
- Blue Manakin
- Blue Nuthatch
- Blue Rock Thrush
- Blue Whistling Thrush
- Bluethroat
- Bluish-fronted Jacamar
- Bluish-slate Antshrike
- Blyth's Hornbill
- Blyth's Pipit
- Blyth's Reed Warbler
- Blyth's Shrike-babbler
- Boat-billed Flycatcher
- Boat-billed Heron
- Bocage's Akalat
- Bocage's Bushshrike
- Bocage's Sunbird
- Bogota Rail
- Bohemian Waxwing
- Böhm's Spinetail
- Bokmakierie
- Bolle's Pigeon
- Bonaparte's Gull
- Bonelli's Eagle
- Bonin Petrel
- Bonin White-eye
- Booted Eagle
- Boreal Chickadee
- Boreal Owl
- Boyer's Cuckooshrike
- Bradfield's Swift
- Brahminy Kite
- Brahminy Starling
- Brambling
- Bran-colored Flycatcher
- Brandt's Mountain Finch
- Brant Goose
- Braun's Bushshrike
- Brazilian Teal
- Brazza's Martin
- Brehm's Tiger Parrot
- Brewer's Blackbird
- Brewer's Sparrow
- Bridled Tern
- Bridled Titmouse
- Bright-rumped Attila
- Bright-rumped Yellow Finch
- Bristle-nosed Barbet
- Bristle-thighed Curlew
- Broad-billed Hummingbird
- Broad-billed Motmot
- Broad-billed Roller
- Broad-billed Sandpiper
- Broad-tailed Hummingbird
- Broad-winged Hawk
- Brolga
- Bronze-tailed Plumeleteer
- Bronze-tailed Starling
- Bronze-winged Duck
- Bronze-winged Jacana
- Bronze-winged Parrot
- Bronze Mannikin
- Bronzed Drongo
- Bronzy Sunbird
- Brown-backed Chat-Tyrant
- Brown-backed Mockingbird
- Brown-backed Scrub Robin
- Brown-backed Woodpecker
- Brown-bellied Swallow
- Brown-billed Scythebill
- Brown-breasted Barbet
- Brown-breasted Gerygone
- Brown-capped Fantail
- Brown-capped Weaver
- Brown-cheeked Fulvetta
- Brown-cheeked Hornbill
- Brown-cheeked Rail
- Brown-chested Alethe
- Brown-crested Flycatcher
- Brown-eared Bulbul
- Brown-headed Barbet
- Brown-headed Cowbird
- Brown-headed Gull
- Brown-headed Paradise Kingfisher
- Brown-headed Parrot
- Brown-hooded Kingfisher
- Brown-necked Raven
- Brown-rumped Foliage-gleaner
- Brown-rumped Seedeater
- Brown-tailed Rock Chat
- Brown-throated Barbet
- Brown-throated Sunbird
- Brown-throated Wattle-eye
- Brown-winged Schiffornis
- Brown-winged Starling
- Brown Babbler
- Brown Booby
- Brown Creeper
- Brown Dipper
- Brown Falcon
- Brown Goshawk
- Brown Hawk-Owl
- Brown Honeyeater
- Brown Inca
- Brown Jacamar
- Brown Lory
- Brown Noddy
- Brown Oriole
- Brown Parisoma
- Brown Pelican
- Brown Quail
- Brown Rock Chat
- Brown Shrike
- Brown Skua
- Brown Snake Eagle
- Brown Teal
- Brown Twinspot
- Brown Violetear
- Brown Woodland Warbler
- Brownish Twistwing
- Brubru
- Bruce's Green Pigeon
- Brush Cuckoo
- Bubbling Cisticola
- Buff-banded Rail
- Buff-barred Warbler
- Buff-bellied Mannikin
- Buff-bellied Monarch
- Buff-bellied Pipit
- Buff-breasted Flycatcher
- Buff-breasted Sandpiper
- Buff-breasted Tody-Tyrant
- Buff-breasted Wren
- Buff-crested Bustard
- Buff-faced Pygmy Parrot
- Buff-fronted Foliage-gleaner
- Buff-headed Coucal
- Buff-rumped Warbler
- Buff-rumped Woodpecker
- Buff-tailed Coronet
- Buff-tailed Sicklebill
- Buff-throated Apalis
- Buff-throated Purpletuft
- Buff-throated Saltator
- Buff-throated Sunbird
- Buff-throated Woodcreeper
- Buff-winged Starfrontlet
- Bufflehead
- Buffy Hummingbird
- Bull-headed Shrike
- Buller's Shearwater
- Bullock's Oriole
- Bulwer's Petrel
- Burchell's Sandgrouse
- Burmese Shrike
- Burrowing Owl