- Baillon's Crake
- Baird's Sandpiper
- Balearic Shearwater
- Baltimore Oriole
- Bananaquit
- Band-rumped Storm Petrel
- Band-tailed Antbird
- Band-tailed Barbthroat
- Band-tailed Manakin
- Band-tailed Pigeon
- Band-tailed Seedeater
- Band-tailed Sierra Finch
- Bar-bellied Woodpecker
- Bar-headed Goose
- Bar-tailed Godwit
- Bare-crowned Antbird
- Bare-faced Ground Dove
- Bare-faced Ibis
- Bare-throated Tiger Heron
- Barn Swallow
- Barnacle Goose
- Barred Antshrike
- Barred Becard
- Barred Forest Falcon
- Barred Fruiteater
- Barred Warbler
- Bat Falcon
- Bay-headed Tanager
- Bay Wren
- Bearded Mountaineer
- Bearded Reedling
- Bearded Screech Owl
- Bearded Vulture
- Belcher's Gull
- Berlepsch's Canastero
- Berthelot's Pipit
- Bicolored Antbird
- Bicolored Wren
- Black-and-white Hawk-Eagle
- Black-and-white Seedeater
- Black-and-white Warbler
- Black-backed Grosbeak
- Black-backed Tody-Flycatcher
- Black-bellied Hummingbird
- Black-bellied Sandgrouse
- Black-bellied Whistling Duck
- Black-billed Nightingale-Thrush
- Black-billed Peppershrike
- Black-billed Seed Finch
- Black-billed Shrike-Tyrant
- Black-billed Thrush
- Black-breasted Hillstar
- Black-browed Albatross
- Black-capped Donacobius
- Black-capped Flycatcher
- Black-capped Hemispingus
- Black-capped Tanager
- Black-capped Tyrannulet
- Black-capped Warbling Finch
- Black-cheeked Ant Tanager
- Black-cheeked Warbler
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Fruiteater
- Black-chinned Mountain Tanager
- Black-collared Hawk
- Black-cowled Oriole
- Black-crested Coquette
- Black-crested Warbler
- Black-crowned Antshrike
- Black-crowned Night Heron
- Black-crowned Tityra
- Black-eared Hemispingus
- Black-faced Antbird
- Black-faced Antthrush
- Black-faced Grosbeak
- Black-faced Ibis
- Black-faced Tanager
- Black-fronted Nunbird
- Black-fronted Piping Guan
- Black-goggled Tanager
- Black-headed Bunting
- Black-headed Gull
- Black-headed Nightingale-Thrush
- Black-headed Saltator
- Black-headed Trogon
- Black-legged Kittiwake
- Black-legged Seriema
- Black-masked Finch
- Black-necked Grebe
- Black-necked Stilt
- Black-necked Swan
- Black-striped Sparrow
- Black-striped Woodcreeper
- Black-tailed Godwit
- Black-tailed Myiobius
- Black-tailed Trainbearer
- Black-throated Flowerpiercer
- Black-throated Green Warbler
- Black-throated Hermit
- Black-throated Huet-huet
- Black-throated Loon
- Black-throated Mango
- Black-throated Shrike-Tanager
- Black-throated Thistletail
- Black-throated Toucanet
- Black-winged Ground Dove
- Black-winged Kite
- Black-winged Pratincole
- Black-winged Stilt
- Black Grouse
- Black Guillemot
- Black Kite
- Black Metaltail
- Black Phoebe
- Black Redstart
- Black Siskin
- Black Skimmer
- Black Stork
- Black Tern
- Black Thrush
- Black Vulture
- Black Woodpecker
- Blackburnian Warbler
- Blackish Oystercatcher
- Blond-crested Woodpecker
- Blue-and-black Tanager
- Blue-and-white Mockingbird
- Blue-and-white Swallow
- Blue-and-yellow Macaw
- Blue-and-yellow Tanager
- Blue-backed Conebill
- Blue-backed Manakin
- Blue-banded Toucanet
- Blue-black Grassquit
- Blue-black Grosbeak
- Blue-capped Tanager
- Blue-chested Hummingbird
- Blue-crowned Parakeet
- Blue-footed Booby
- Blue-grey Tanager
- Blue-headed Parrot
- Blue-naped Chlorophonia
- Blue-necked Tanager
- Blue-tailed Emerald
- Blue-tailed Hummingbird
- Blue-throated Macaw
- Blue-throated Motmot
- Blue-throated Sapphire
- Blue-winged Mountain Tanager
- Blue-winged Warbler
- Blue Dacnis
- Blue Rock Thrush
- Bluethroat
- Bluish-fronted Jacamar
- Bluish-grey Saltator
- Bluish-slate Antshrike
- Blyth's Reed Warbler
- Boat-billed Flycatcher
- Boat-billed Heron
- Bohemian Waxwing
- Bolivian Blackbird
- Bolivian Brushfinch
- Bolivian Tyrannulet
- Bonelli's Eagle
- Booted Eagle
- Booted Warbler
- Boreal Owl
- Brambling
- Bran-colored Flycatcher
- Brant Goose
- Brazilian Teal
- Bright-rumped Attila
- Bright-rumped Yellow Finch
- Broad-billed Motmot
- Bronze-winged Parrot
- Bronzy Hermit
- Bronzy Inca
- Brown-and-yellow Marshbird
- Brown-backed Chat-Tyrant
- Brown-backed Mockingbird
- Brown-backed Solitaire
- Brown-bellied Swallow
- Brown-capped Tit-Spinetail
- Brown-capped Vireo
- Brown-chested Martin
- Brown-crested Flycatcher
- Brown Booby
- Brown Inca
- Brown Jay
- Brown Noddy
- Brown Nunlet
- Brown Pelican
- Brown Shrike
- Brown Violetear
- Brownish Twistwing
- Buff-bellied Puffbird
- Buff-breasted Earthcreeper
- Buff-breasted Sandpiper
- Buff-fronted Foliage-gleaner
- Buff-necked Ibis
- Buff-rumped Warbler
- Buff-tailed Coronet
- Buff-throated Saltator
- Buff-winged Cinclodes
- Buff-winged Starfrontlet
- Buffy Tuftedcheek
- Bulwer's Petrel
- Burrowing Owl
- Bushy-crested Jay