- Bahia Antwren
- Baird's Sandpiper
- Bananaquit
- Band-tailed Hornero
- Band-tailed Manakin
- Band-tailed Pigeon
- Band-tailed Seedeater
- Band-tailed Sierra Finch
- Bar-throated Apalis
- Bare-cheeked Babbler
- Bare-faced Curassow
- Bare-faced Ground Dove
- Bare-faced Ibis
- Bare-throated Bellbird
- Barn Swallow
- Barred Antshrike
- Barred Fruiteater
- Bat Falcon
- Bateleur
- Bay-headed Tanager
- Bay Wren
- Bearded Scrub Robin
- Bearded Vulture
- Bearded Woodpecker
- Belcher's Gull
- Bennett's Woodpecker
- Bertoni's Antbird
- Bicolored Conebill
- Bicolored Hawk
- Bicolored Wren
- Black-and-white Mannikin
- Black-backed Grosbeak
- Black-backed Puffback
- Black-backed Thornbill
- Black-backed Water Tyrant
- Black-banded Owl
- Black-banded Woodcreeper
- Black-bellied Antwren
- Black-bellied Bustard
- Black-bellied Whistling Duck
- Black-billed Mountain Toucan
- Black-billed Scythebill
- Black-billed Thrush
- Black-capped Becard
- Black-capped Donacobius
- Black-capped Foliage-gleaner
- Black-capped Warbling Finch
- Black-cheeked Gnateater
- Black-chested Jay
- Black-chested Prinia
- Black-chested Snake Eagle
- Black-chinned Siskin
- Black-collared Barbet
- Black-collared Hawk
- Black-crowned Night Heron
- Black-crowned Tchagra
- Black-crowned Tityra
- Black-eared Fairy
- Black-faced Dacnis
- Black-faced Grassquit
- Black-faced Ibis
- Black-faced Tanager
- Black-faced Waxbill
- Black-fronted Nunbird
- Black-goggled Tanager
- Black-headed Heron
- Black-headed Oriole
- Black-hooded Sierra Finch
- Black-hooded Sunbeam
- Black-masked Finch
- Black-necked Swan
- Black-tailed Tityra
- Black-tailed Trogon
- Black-throated Canary
- Black-throated Grosbeak
- Black-throated Mango
- Black-throated Saltator
- Black-throated Toucanet
- Black-winged Kite
- Black-winged Stilt
- Black Coucal
- Black Crake
- Black Cuckooshrike
- Black Heron
- Black Jacobin
- Black Phoebe
- Black Siskin
- Black Skimmer
- Black Stork
- Black Vulture
- Blackburnian Warbler
- Blackish Oystercatcher
- Blackish Rail
- Blacksmith Lapwing
- Blaze-winged Parakeet
- Blond-crested Woodpecker
- Blue-and-white Swallow
- Blue-and-yellow Macaw
- Blue-and-yellow Tanager
- Blue-backed Conebill
- Blue-backed Manakin
- Blue-billed Black Tyrant
- Blue-black Grassquit
- Blue-capped Tanager
- Blue-cheeked Bee-eater
- Blue-crowned Parakeet
- Blue-crowned Trogon
- Blue-eyed Ground Dove
- Blue-headed Parrot
- Blue-naped Chlorophonia
- Blue-necked Tanager
- Blue-throated Macaw
- Blue Crane
- Blue Dacnis
- Blue Finch
- Blue Manakin
- Blue Waxbill
- Bluish-grey Saltator
- Boat-billed Flycatcher
- Boat-billed Heron
- Bokmakierie
- Bolivian Blackbird
- Bolivian Brushfinch
- Bolivian Slaty Antshrike
- Bolivian Warbling Finch
- Bradfield's Hornbill
- Bran-colored Flycatcher
- Brassy-breasted Tanager
- Brazilian Merganser
- Brazilian Ruby
- Brazilian Tanager
- Brazilian Teal
- Bridled Tern
- Bright-rumped Yellow Finch
- Brimstone Canary
- Broad-billed Motmot
- Broad-billed Roller
- Bronze-winged Courser
- Bronze-winged Parrot
- Bronze Mannikin
- Brown-backed Honeybird
- Brown-backed Mockingbird
- Brown-capped Tit-Spinetail
- Brown-capped Whitestart
- Brown-chested Martin
- Brown-crested Flycatcher
- Brown-crowned Tchagra
- Brown-headed Parrot
- Brown-hooded Gull
- Brown-hooded Kingfisher
- Brown-throated Martin
- Brown-throated Parakeet
- Brown Firefinch
- Brown Noddy
- Brown Snake Eagle
- Brubru
- Buff-browed Foliage-gleaner
- Buff-fronted Foliage-gleaner
- Buff-necked Ibis
- Buff-throated Saltator
- Buff-throated Warbling Finch
- Buff-throated Woodcreeper
- Buffy-fronted Seedeater
- Buffy Hummingbird
- Burchell's Coucal
- Burchell's Sandgrouse
- Burchell's Starling
- Burnished-buff Tanager
- Burrowing Owl