- Bananaquit
- Band-rumped Swift
- Band-tailed Antbird
- Bar-tailed Godwit
- Bare-faced Curassow
- Bare-faced Ibis
- Barn Swallow
- Barred Antshrike
- Bat Falcon
- Bay-headed Tanager
- Bearded Tachuri
- Bicolored Conebill
- Black-and-white Mannikin
- Black-backed Water Tyrant
- Black-banded Woodcreeper
- Black-bellied Cuckoo
- Black-bellied Whistling Duck
- Black-capped Becard
- Black-capped Donacobius
- Black-collared Hawk
- Black-crested Antshrike
- Black-crowned Night Heron
- Black-eared Fairy
- Black-faced Dacnis
- Black-faced Grassquit
- Black-faced Hawk
- Black-faced Tanager
- Black-fronted Nunbird
- Black-goggled Tanager
- Black-headed Antbird
- Black-headed Gull
- Black-headed Parrot
- Black-necked Aracari
- Black-necked Stilt
- Black-necked Weaver
- Black-spotted Barbet
- Black-tailed Tityra
- Black-tailed Trogon
- Black-throated Mango
- Black Caracara
- Black Hawk-Eagle
- Black Jacobin
- Black Kite
- Black Nunbird
- Black Redstart
- Black Skimmer
- Black Tern
- Black Vulture
- Blackish Nightjar
- Blond-crested Woodpecker
- Blue-and-white Swallow
- Blue-and-yellow Macaw
- Blue-backed Manakin
- Blue-billed Black Tyrant
- Blue-black Grassquit
- Blue-breasted Bee-eater
- Blue-cheeked Amazon
- Blue-chinned Sapphire
- Blue-crowned Trogon
- Blue-grey Tanager
- Blue-headed Parrot
- Blue-tailed Emerald
- Blue-winged Teal
- Blue Dacnis
- Bluish-grey Saltator
- Boat-billed Flycatcher
- Boat-billed Heron
- Brazilian Ruby
- Brazilian Tanager
- Bright-rumped Attila
- Broad-winged Hawk
- Bronze Mannikin
- Bronzy Jacamar
- Brown-bellied Stipplethroat
- Brown-chested Martin
- Brown-hooded Kingfisher
- Brown-throated Parakeet
- Brown Booby
- Buff-necked Ibis
- Buff-throated Saltator
- Buff-throated Woodcreeper
- Burnished-buff Tanager
- Burrowing Owl