- Baer's Pochard
- Bahama Mockingbird
- Baillon's Crake
- Baird's Flycatcher
- Baird's Sandpiper
- Baird's Trogon
- Bald Eagle
- Balicassiao
- Baltimore Oriole
- Bananaquit
- Band-backed Wren
- Band-rumped Storm Petrel
- Band-rumped Swift
- Band-tailed Antbird
- Band-tailed Antwren
- Band-tailed Hornero
- Band-tailed Pigeon
- Band-tailed Seedeater
- Band-tailed Sierra Finch
- Banded Wren
- Bank Myna
- Bar-throated Apalis
- Bar-throated Minla
- Bar-winged Flycatcher-shrike
- Bare-faced Ground Dove
- Bare-faced Ibis
- Bare-throated Bellbird
- Bare-throated Tiger Heron
- Barn Swallow
- Barred Antshrike
- Barred Cuckooshrike
- Barred Forest Falcon
- Barred Hawk
- Barred Owl
- Barred Owlet-nightjar
- Barrow's Goldeneye
- Bat Falcon
- Bay-breasted Cuckoo
- Bay-breasted Warbler
- Bay-chested Warbling Finch
- Bay-headed Tanager
- Bay Woodpecker
- Bay Wren
- Bearded Vulture
- Beautiful Fruit Dove
- Beautiful Nuthatch
- Beautiful Sibia
- Bee Hummingbird
- Belcher's Gull
- Belford's Melidectes
- Bell's Sparrow
- Bell's Vireo
- Belted Kingfisher
- Beryl-spangled Tanager
- Berylline Hummingbird
- Besra
- Bewick's Wren
- Bicknell's Thrush
- Bicolored Conebill
- Biscutate Swift
- Bismarck Crow
- Black-and-buff Woodpecker
- Black-and-chestnut Eagle
- Black-and-gold Cotinga
- Black-and-rufous Warbling Finch
- Black-and-white Monjita
- Black-and-white Owl
- Black-and-white Warbler
- Black-and-yellow Phainoptila
- Black-and-yellow Tanager
- Black-backed Bush Tanager
- Black-backed Butcherbird
- Black-backed Grosbeak
- Black-backed Water Tyrant
- Black-backed Woodpecker
- Black-bellied Cuckoo
- Black-bellied Malkoha
- Black-bellied Myzomela
- Black-bellied Storm Petrel
- Black-bellied Whistling Duck
- Black-billed Magpie
- Black-billed Nightingale-Thrush
- Black-billed Shrike-Tyrant
- Black-billed Thrush
- Black-breasted Thrush
- Black-browed Albatross
- Black-browed Barbet
- Black-browed Reed Warbler
- Black-capped Antwren
- Black-capped Chickadee
- Black-capped Donacobius
- Black-capped Flycatcher
- Black-capped Foliage-gleaner
- Black-capped Hemispingus
- Black-capped Kingfisher
- Black-capped Lory
- Black-capped Sparrow
- Black-capped Tanager
- Black-capped White-eye
- Black-casqued Hornbill
- Black-cheeked Warbler
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chinned Siskin
- Black-chinned Sparrow
- Black-collared Hawk
- Black-collared Starling
- Black-cowled Oriole
- Black-cowled Saltator
- Black-crested Bulbul
- Black-crested Finch
- Black-crested Warbler
- Black-crowned Antshrike
- Black-crowned Night Heron
- Black-crowned Palm-tanager
- Black-eared Barbet
- Black-eared Fairy
- Black-eared Shrike-babbler
- Black-faced Antbird
- Black-faced Antthrush
- Black-faced Grassquit
- Black-faced Solitaire
- Black-faced Spoonbill
- Black-faced Tanager
- Black-faced Warbler
- Black-fronted Ground Tyrant
- Black-fronted Nunbird
- Black-goggled Tanager
- Black-headed Bulbul
- Black-headed Greenfinch
- Black-headed Grosbeak
- Black-headed Parrot
- Black-headed Saltator
- Black-headed Tanager
- Black-headed Trogon
- Black-hooded Antshrike
- Black-hooded Sierra Finch
- Black-hooded Thrush
- Black-legged Kittiwake
- Black-naped Oriole
- Black-necked Aracari
- Black-necked Crane
- Black-necked Grebe
- Black-necked Swan
- Black-spotted Barbet
- Black-spotted Bare-eye
- Black-striped Sparrow
- Black-tailed Crake
- Black-tailed Gnatcatcher
- Black-tailed Gull
- Black-tailed Tityra
- Black-tailed Trainbearer
- Black-tailed Trogon
- Black-thighed Falconet
- Black-throated Blue Warbler
- Black-throated Bushtit
- Black-throated Canary
- Black-throated Green Warbler
- Black-throated Grey Warbler
- Black-throated Huet-huet
- Black-throated Mango
- Black-throated Parrotbill
- Black-throated Saltator
- Black-throated Sparrow
- Black-throated Tody-Tyrant
- Black-throated Toucanet
- Black-whiskered Vireo
- Black-winged Ground Dove
- Black-winged Oriole
- Black-winged Saltator
- Black-winged Snowfinch
- Black Berrypecker
- Black Bulbul
- Black Butcherbird
- Black Catbird
- Black Curassow
- Black Eagle
- Black Flowerpiercer
- Black Guan
- Black Hawk-Eagle
- Black Heron
- Black Jacobin
- Black Laughingthrush
- Black Noddy
- Black Nunbird
- Black Oystercatcher
- Black Phoebe
- Black Scoter
- Black Scrub Robin
- Black Siskin
- Black Skimmer
- Black Sunbird
- Black Tern
- Black Turnstone
- Black Vulture
- Blackburnian Warbler
- Blackish Nightjar
- Blackish Oystercatcher
- Blackish Pewee
- Blackish Rail
- Blackish Tapaculo
- Blackpoll Warbler
- Blacksmith Thrush
- Blanford's Snowfinch
- Blond-crested Woodpecker
- Blood-eared Parakeet
- Blue-and-white Flycatcher
- Blue-and-white Swallow
- Blue-and-yellow Macaw
- Blue-and-yellow Tanager
- Blue-backed Conebill
- Blue-backed Tanager
- Blue-bellied Roller
- Blue-billed Black Tyrant
- Blue-black Grassquit
- Blue-breasted Kingfisher
- Blue-capped Ifrit
- Blue-capped Manakin
- Blue-capped Puffleg
- Blue-capped Tanager
- Blue-chested Hummingbird
- Blue-chinned Sapphire
- Blue-crowned Hanging Parrot
- Blue-crowned Parakeet
- Blue-crowned Trogon
- Blue-eyed Cockatoo
- Blue-footed Booby
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-headed Fantail
- Blue-headed Macaw
- Blue-headed Parrot
- Blue-headed Vireo
- Blue-lored Antbird
- Blue-naped Chlorophonia
- Blue-naped Mousebird
- Blue-necked Tanager
- Blue-spotted Wood Dove
- Blue-tailed Emerald
- Blue-throated Barbet
- Blue-throated Bee-eater
- Blue-throated Blue Flycatcher
- Blue-throated Mountaingem
- Blue-throated Piping Guan
- Blue-throated Roller
- Blue-throated Sapphire
- Blue-throated Toucanet
- Blue-winged Kookaburra
- Blue-winged Macaw
- Blue-winged Minla
- Blue-winged Mountain Tanager
- Blue-winged Teal
- Blue Bunting
- Blue Dacnis
- Blue Grosbeak
- Blue Ground Dove
- Blue Jay
- Blue Manakin
- Blue Mockingbird
- Blue Petrel
- Blue Rock Thrush
- Bluethroat
- Bluish-grey Saltator
- Bluish-slate Antshrike
- Blyth's Hornbill
- Blyth's Leaf Warbler
- Blyth's Pipit
- Boat-billed Flycatcher
- Boat-billed Heron
- Boat-tailed Grackle
- Bobolink
- Bolivian Brushfinch
- Bonaparte's Gull
- Boreal Chickadee
- Bornean Treepie
- Boucard's Wren
- Boyer's Cuckooshrike
- Brahminy Kite
- Bran-colored Flycatcher
- Brandt's Cormorant
- Brant Goose
- Brassy-breasted Tanager
- Brazilian Ruby
- Brazilian Tanager
- Brehm's Tiger Parrot
- Brewer's Blackbird
- Brewer's Sparrow
- Bridled Quail-Dove
- Bridled Titmouse
- Bright-rumped Attila
- Bright-rumped Yellow Finch
- Bristle-thighed Curlew
- Broad-billed Motmot
- Broad-billed Roller
- Broad-billed Sandpiper
- Broad-billed Tody
- Broad-winged Hawk
- Bronze-winged Parrot
- Bronze Ground Dove
- Bronzed Drongo
- Bronzy Jacamar
- Brown-and-yellow Marshbird
- Brown-backed Chat-Tyrant
- Brown-bellied Swallow
- Brown-breasted Bulbul
- Brown-capped Tyrannulet
- Brown-capped Vireo
- Brown-capped Whitestart
- Brown-cheeked Fulvetta
- Brown-cheeked Rail
- Brown-chested Martin
- Brown-crested Flycatcher
- Brown-eared Bulbul
- Brown-eared Woodpecker
- Brown-headed Cowbird
- Brown-headed Gull
- Brown-headed Paradise Kingfisher
- Brown-hooded Gull
- Brown-hooded Parrot
- Brown-throated Fulvetta
- Brown-throated Parakeet
- Brown-winged Parrotbill
- Brown Accentor
- Brown Booby
- Brown Cacholote
- Brown Crake
- Brown Jay
- Brown Mesite
- Brown Noddy
- Brown Oriole
- Brown Pelican
- Brown Shrike
- Brown Sicklebill
- Brown Skua
- Brown Snake Eagle
- Brown Tanager
- Brown Thrasher
- Brown Tinamou
- Brown Trembler
- Brown Violetear
- Brown Woodland Warbler
- Brush Cuckoo
- Buff-barred Warbler
- Buff-bellied Hummingbird
- Buff-bellied Mannikin
- Buff-bellied Pipit
- Buff-bellied Puffbird
- Buff-breasted Earthcreeper
- Buff-breasted Earthcreeper (jelskii)
- Buff-breasted Mountain Tanager
- Buff-breasted Tody-Tyrant
- Buff-breasted Wren
- Buff-fronted Foliage-gleaner
- Buff-rumped Warbler
- Buff-spotted Flameback
- Buff-throated Saltator
- Buff-throated Sunbird
- Buff-throated Warbling Finch
- Buff-winged Cinclodes
- Bufflehead
- Bull-headed Shrike
- Bullock's Oriole
- Bumblebee Hummingbird
- Burmese Shrike
- Burnished-buff Tanager
- Burrowing Owl
- Burrowing Parrot