- Baer's Pochard
- Bahia Spinetail
- Bahia Tapaculo
- Bahia Wagtail-Tyrant
- Baikal Teal
- Baird's Flycatcher
- Band-backed Wren
- Band-bellied Owl
- Band-tailed Guan
- Band-tailed Manakin
- Band-tailed Nighthawk
- Band-tailed Oropendola
- Band-tailed Seedeater
- Banded Antbird
- Banded Broadbill
- Banded Ground Cuckoo
- Banded Kingfisher
- Banded Quail
- Bank Myna
- Bar-headed Goose
- Bar-tailed Trogon
- Bar-throated Apalis
- Bar-throated Minla
- Bar-winged Oriole
- Bar-winged Weaver
- Bar-winged Wood Wren
- Bar-winged Wren-Babbler
- Bare-crowned Antbird
- Bare-eyed Thrush
- Bare-faced Ibis
- Bare-throated Tiger Heron
- Barn Swallow
- Barred Antshrike
- Barred Cuckoo-Dove
- Barred Hawk
- Barred Honey Buzzard
- Barred Long-tailed Cuckoo
- Barred Puffbird
- Barred Rail
- Basra Reed Warbler
- Bassian Thrush
- Bateleur
- Bates's Nightjar
- Baudo Guan
- Bay-chested Warbling Finch
- Bay-crowned Brushfinch
- Bay Wren
- Beach Kingfisher
- Beach Stone-curlew
- Bearded Screech Owl
- Bearded Tachuri
- Beaudouin's Snake Eagle
- Beautiful Fruit Dove
- Beautiful Sibia
- Beautiful Woodpecker
- Belcher's Gull
- Belted Flycatcher
- Bengal Bush Lark
- Bernier's Teal
- Bernier's Vanga
- Bertoni's Antbird
- Bertram's Weaver
- Beryl-spangled Tanager
- Berylline Hummingbird
- Besra
- Bewick's Wren
- Bhutan Laughingthrush
- Biak Black Flycatcher
- Biak Coucal
- Biak Scrubfowl
- Bicolored Antpitta
- Bicolored Conebill
- Bicolored Wren
- Biscutate Swift
- Black-and-crimson Oriole
- Black-and-gold Tanager
- Black-and-red Broadbill
- Black-and-rufous Warbling Finch
- Black-and-tawny Seedeater
- Black-and-yellow Grosbeak
- Black-backed Antshrike
- Black-backed Barbet
- Black-backed Oriole
- Black-backed Tanager
- Black-backed Tody-Flycatcher
- Black-backed Woodpecker
- Black-banded Woodcreeper
- Black-bellied Cuckoo
- Black-bellied Seedeater
- Black-bellied Storm Petrel
- Black-billed Capercaillie
- Black-billed Coucal
- Black-billed Flycatcher
- Black-breasted Parrotbill
- Black-breasted Weaver
- Black-browed Barbet
- Black-capped Gnatcatcher
- Black-capped Parakeet
- Black-capped Screech Owl
- Black-capped Swallow
- Black-capped White-eye
- Black-casqued Hornbill
- Black-cheeked Gnateater
- Black-cheeked Lovebird
- Black-chested Prinia
- Black-chested Sparrow
- Black-chested Tyrant
- Black-chinned Antbird
- Black-chinned Siskin
- Black-chinned Yuhina
- Black-collared Apalis
- Black-collared Jay
- Black-collared Swallow
- Black-crested Antshrike
- Black-crested Tit-Tyrant
- Black-crested Titmouse
- Black-crested Warbler
- Black-crowned Antshrike
- Black-crowned Sparrow-Lark
- Black-crowned Tanager
- Black-crowned Waxbill
- Black-faced Babbler
- Black-faced Bunting
- Black-faced Cormorant
- Black-faced Cotinga
- Black-faced Ibis
- Black-faced Laughingthrush
- Black-faced Rufous Warbler
- Black-faced Sandgrouse
- Black-faced Tanager
- Black-faced Warbler
- Black-fronted White-eye
- Black-girdled Barbet
- Black-goggled Tanager
- Black-headed Apalis
- Black-headed Duck
- Black-headed Hemispingus
- Black-headed Lapwing
- Black-headed Nightingale-Thrush
- Black-headed Tanager
- Black-lored Babbler
- Black-lored Cisticola
- Black-naped Fruit Dove
- Black-necked Weaver
- Black-necked Woodpecker
- Black-necklaced Scimitar Babbler
- Black-polled Yellowthroat
- Black-rumped Magpie
- Black-sided Flowerpecker
- Black-sided Robin
- Black-spectacled Brushfinch
- Black-striped Sparrow
- Black-tailed Antbird
- Black-tailed Trainbearer
- Black-thighed Puffleg
- Black-throated Antbird
- Black-throated Antshrike
- Black-throated Brilliant
- Black-throated Bushtit
- Black-throated Coucal
- Black-throated Flowerpiercer
- Black-throated Huet-huet
- Black-throated Jay
- Black-throated Magpie-Jay
- Black-throated Mango
- Black-throated Robin
- Black-throated Sunbird
- Black-throated Wattle-eye
- Black-throated Wren-Babbler
- Black-tipped Cotinga
- Black-vented Shearwater
- Black-winged Ground Dove
- Black-winged Lapwing
- Black Antbird
- Black Antshrike
- Black Bittern
- Black Bulbul
- Black Bushbird
- Black Butcherbird
- Black Catbird
- Black Cuckoo
- Black Cuckooshrike
- Black Drongo
- Black Hornbill
- Black Kite
- Black Lory
- Black Manakin
- Black Metaltail
- Black Nunbird
- Black Oriole
- Black Scrub Robin
- Black Skimmer
- Black Spinetail
- Black Sunbird
- Black Thicket Fantail
- Black Tinamou
- Blackcap Illadopsis
- Blackish-blue Seedeater
- Blackish Cinclodes
- Blackish Nightjar
- Blackish Pewee
- Blackish Rail
- Blakiston's Fish Owl
- Blood-colored Woodpecker
- Blood Pheasant
- Blue-and-white Flycatcher
- Blue-and-white Kingfisher
- Blue-and-white Mockingbird
- Blue-and-yellow Tanager
- Blue-banded Pitta
- Blue-bellied Roller
- Blue-billed Curassow
- Blue-black Kingfisher
- Blue-capped Cordon-bleu
- Blue-capped Fruit Dove
- Blue-capped Motmot
- Blue-capped Rock Thrush
- Blue-cheeked Bee-eater
- Blue-chested Hummingbird
- Blue-crowned Parakeet
- Blue-eyed Ground Dove
- Blue-footed Booby
- Blue-headed Bee-eater
- Blue-headed Coucal
- Blue-headed Crested Flycatcher
- Blue-headed Pitta
- Blue-headed Sapphire
- Blue-headed Sunbird
- Blue-moustached Bee-eater
- Blue-naped Chlorophonia
- Blue-necked Jacamar
- Blue-rumped Manakin
- Blue-shouldered Robin-Chat
- Blue-tailed Emerald
- Blue-throated Bee-eater
- Blue-throated Motmot
- Blue-throated Mountaingem
- Blue-throated Piping Guan
- Blue-throated Roller
- Blue-tufted Starthroat
- Blue-whiskered Tanager
- Blue-winged Kookaburra
- Blue-winged Macaw
- Blue-winged Minla
- Blue-winged Mountain Tanager
- Blue Manakin
- Blue Mockingbird
- Blue Nuthatch
- Blue Petrel
- Blue Quail
- Blue Swallow
- Blue Whistling Thrush
- Bluish-fronted Jacamar
- Blyth's Hawk-Eagle
- Blyth's Leaf Warbler
- Bocage's Akalat
- Bogota Rail
- Böhm's Bee-eater
- Böhm's Flycatcher
- Bolivian Slaty Antshrike
- Bonaparte's Parakeet
- Boran Cisticola
- Bornean Banded Pitta
- Bornean Blue Flycatcher
- Bornean Bulbul
- Bornean Crested Fireback
- Bornean Frogmouth
- Bornean Green Magpie
- Bornean Peacock-Pheasant
- Bornean Shortwing
- Bornean Spiderhunter
- Bornean Stubtail
- Bornean Swiftlet
- Bornean Treepie
- Bornean Whistler
- Bornean Whistling Thrush
- Bornean Wren-Babbler
- Boulder Chat
- Brahminy Kite
- Brahminy Starling
- Bran-colored Flycatcher
- Brasilia Tapaculo
- Brassy-breasted Tanager
- Brazilian Laniisoma
- Brazilian Merganser
- Brazilian Ruby
- Bridled Sparrow
- Bright-rumped Yellow Finch
- Bristled Grassbird
- Broad-billed Sandpiper
- Broad-billed Tody
- Broad-tailed Hummingbird
- Bronze-brown Cowbird
- Bronze-green Euphonia
- Bronze-olive Pygmy Tyrant
- Bronze-tailed Comet
- Bronze-tailed Starling
- Bronze-winged Duck
- Bronze-winged Woodpecker
- Bronzed Cowbird
- Bronzy Jacamar
- Brooks's Leaf Warbler
- Brown-backed Solitaire
- Brown-banded Antpitta
- Brown-banded Puffbird
- Brown-billed Scythebill
- Brown-breasted Barbet
- Brown-breasted Flycatcher
- Brown-breasted Gerygone
- Brown-capped Babbler
- Brown-capped Tyrannulet
- Brown-capped Weaver
- Brown-chested Alethe
- Brown-crested Flycatcher
- Brown-crowned Tchagra
- Brown-flanked Bush Warbler
- Brown-flanked Tanager
- Brown-headed Crow
- Brown-headed Greenlet
- Brown-headed Thrush
- Brown-hooded Gull
- Brown-throated Fulvetta
- Brown-throated Sunbird
- Brown-winged Schiffornis
- Brown Babbler
- Brown Barbet
- Brown Bullfinch
- Brown Bush Warbler
- Brown Cacholote
- Brown Firefinch
- Brown Mesite
- Brown Nunlet
- Brown Parrotbill
- Brown Prinia
- Brown Quail
- Brown Rock Chat
- Brown Shrike
- Brown Skua
- Brown Tanager
- Brown Violetear
- Brown Wood Owl
- Brownish Twistwing
- Buff-banded Rail
- Buff-bellied Puffbird
- Buff-breasted Wren
- Buff-bridled Inca Finch
- Buff-browed Foliage-gleaner
- Buff-cheeked Tody-Flycatcher
- Buff-crested Bustard
- Buff-fronted Foliage-gleaner
- Buff-fronted Owl
- Buff-sided Robin
- Buff-spotted Woodpecker
- Buff-tailed Sicklebill
- Buff-thighed Puffleg
- Buff-throated Apalis
- Buff-throated Warbling Finch
- Buff-throated Woodcreeper
- Buff-winged Cinclodes
- Buff-winged Starfrontlet
- Buffy-fronted Seedeater
- Buffy Fish Owl
- Buffy Helmetcrest
- Buffy Hummingbird
- Buffy Pipit
- Buller's Albatross
- Bulwer's Petrel
- Bulwer's Pheasant
- Bumblebee Hummingbird
- Burchell's Courser
- Burnished-buff Tanager
- Burrowing Owl
- Burrowing Parrot
- Bushveld Pipit