- Baird's Sandpiper
- Bananaquit
- Band-tailed Seedeater
- Bar-throated Apalis
- Bare-cheeked Babbler
- Bare-faced Ground Dove
- Barn Swallow
- Barred Fruiteater
- Bateleur
- Bay-headed Tanager
- Bearded Scrub Robin
- Bearded Vulture
- Bearded Woodpecker
- Belcher's Gull
- Bennett's Woodpecker
- Black-backed Puffback
- Black-banded Woodcreeper
- Black-bellied Bustard
- Black-capped Donacobius
- Black-capped Warbling Finch
- Black-chested Prinia
- Black-chested Snake Eagle
- Black-collared Barbet
- Black-collared Hawk
- Black-crowned Night Heron
- Black-crowned Tchagra
- Black-faced Waxbill
- Black-fronted Nunbird
- Black-headed Heron
- Black-headed Oriole
- Black-hooded Sierra Finch
- Black-tailed Trogon
- Black-throated Canary
- Black-winged Kite
- Black-winged Stilt
- Black Coucal
- Black Crake
- Black Cuckooshrike
- Black Heron
- Black Siskin
- Black Skimmer
- Black Stork
- Black Vulture
- Blackish Oystercatcher
- Blacksmith Lapwing
- Blue-backed Manakin
- Blue-cheeked Bee-eater
- Blue-crowned Parakeet
- Blue-crowned Trogon
- Blue Crane
- Blue Waxbill
- Bluish-grey Saltator
- Boat-billed Flycatcher
- Bokmakierie
- Bolivian Blackbird
- Bolivian Brushfinch
- Bolivian Slaty Antshrike
- Bradfield's Hornbill
- Brazilian Tanager
- Bridled Tern
- Brimstone Canary
- Broad-billed Roller
- Bronze-winged Courser
- Bronze Mannikin
- Brown-backed Honeybird
- Brown-backed Mockingbird
- Brown-capped Tit-Spinetail
- Brown-crowned Tchagra
- Brown-headed Parrot
- Brown-hooded Kingfisher
- Brown-throated Martin
- Brown Firefinch
- Brown Noddy
- Brown Snake Eagle
- Brubru
- Buff-throated Woodcreeper
- Burchell's Coucal
- Burchell's Sandgrouse
- Burchell's Starling
- Burnished-buff Tanager
- Burrowing Owl