- Baikal Teal
- Baird's Flycatcher
- Baltimore Oriole
- Bananaquit
- Band-backed Wren
- Band-tailed Barbthroat
- Band-tailed Guan
- Band-tailed Hornero
- Band-tailed Pigeon
- Bar-headed Goose
- Bar-tailed Godwit
- Bar-tailed Lark
- Barbary Partridge
- Bare-faced Curassow
- Bare-faced Ibis
- Bare-throated Tiger Heron
- Barn Swallow
- Barnacle Goose
- Barred Antshrike
- Barred Owl
- Barrow's Goldeneye
- Bat Falcon
- Bateleur
- Bay-headed Tanager
- Beach Kingfisher
- Bearded Barbet
- Bearded Vulture
- Beautiful Sunbird
- Biak Hooded Pitta
- Biak Scops Owl
- Bicolored Antpitta
- Bicolored Hawk
- Bicolored Wren
- Black-and-gold Tanager
- Black-and-white Owl
- Black-and-white Warbler
- Black-backed Water Tyrant
- Black-bellied Cuckooshrike
- Black-bellied Sandgrouse
- Black-bellied Whistling Duck
- Black-billed Nightingale-Thrush
- Black-billed Shrike-Tyrant
- Black-billed Thrush
- Black-billed Wood Dove
- Black-browed Albatross
- Black-capped Chickadee
- Black-capped Donacobius
- Black-capped Tanager
- Black-cheeked Lovebird
- Black-cheeked Warbler
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Jay
- Black-chinned Mountain Tanager
- Black-collared Hawk
- Black-crested Antshrike
- Black-crowned Antshrike
- Black-crowned Night Heron
- Black-crowned Sparrow-Lark
- Black-crowned Tchagra
- Black-crowned Tityra
- Black-faced Grosbeak
- Black-faced Laughingthrush
- Black-fronted Nunbird
- Black-fronted Wood Quail
- Black-headed Gull
- Black-headed Parrot
- Black-headed Saltator
- Black-headed Tanager
- Black-headed Weaver
- Black-legged Kittiwake
- Black-masked Finch
- Black-necked Grebe
- Black-necked Swan
- Black-tailed Godwit
- Black-tailed Tityra
- Black-tailed Trainbearer
- Black-throated Green Warbler
- Black-throated Mango
- Black-throated Saltator
- Black-winged Ground Dove
- Black-winged Saltator
- Black-winged Stilt
- Black Caracara
- Black Crake
- Black Crowned Crane
- Black Drongo
- Black Flowerpiercer
- Black Guillemot
- Black Kite
- Black Nunbird
- Black Phoebe
- Black Redstart
- Black Scrub Robin
- Black Sicklebill
- Black Skimmer
- Black Stork
- Black Swan
- Black Vulture
- Black Wheatear
- Black Woodpecker
- Blackburnian Warbler
- Blackcap Babbler
- Blackstart
- Blue-and-white Swallow
- Blue-and-yellow Macaw
- Blue-bellied Roller
- Blue-black Grassquit
- Blue-breasted Kingfisher
- Blue-cheeked Bee-eater
- Blue-chested Hummingbird
- Blue-crowned Trogon
- Blue-footed Booby
- Blue-fronted Redstart
- Blue-grey Tanager
- Blue-headed Parrot
- Blue-headed Vireo
- Blue-naped Chlorophonia
- Blue-naped Mousebird
- Blue-necked Tanager
- Blue-throated Barbet
- Blue-throated Toucanet
- Blue-winged Mountain Tanager
- Blue Dacnis
- Blue Jay
- Blue Rock Thrush
- Bluethroat
- Bluish-grey Saltator
- Blyth's Hornbill
- Boat-billed Flycatcher
- Boat-billed Heron
- Bonelli's Eagle
- Booted Eagle
- Brahminy Kite
- Brambling
- Brant Goose
- Bridled Tern
- Broad-billed Motmot
- Bronze-tailed Starling
- Bronze-winged Jacana
- Bronze-winged Parrot
- Bronzy Inca
- Brown-backed Chat-Tyrant
- Brown-backed Honeyeater
- Brown-banded Antpitta
- Brown-bellied Swallow
- Brown-capped Tyrannulet
- Brown-capped Vireo
- Brown-chested Martin
- Brown-crested Flycatcher
- Brown-headed Crow
- Brown-hooded Parrot
- Brown-necked Raven
- Brown Babbler
- Brown Booby
- Brown Fish Owl
- Brown Honeyeater
- Brown Inca
- Brown Jay
- Brown Noddy
- Brown Pelican
- Brown Skua
- Brown Violetear
- Bruce's Green Pigeon
- Brush Cuckoo
- Buff-breasted Mountain Tanager
- Buff-necked Ibis
- Buff-rumped Warbler
- Buff-spotted Flameback
- Buff-tailed Coronet
- Buff-throated Saltator
- Buff-throated Woodcreeper
- Buff-winged Starfrontlet
- Buffy Hummingbird
- Burrowing Owl
- Burrowing Parrot