- Baird's Sandpiper
- Bald Eagle
- Baltimore Oriole
- Bananaquit
- Band-tailed Guan
- Bare-legged Owl
- Bare-throated Tiger Heron
- Barn Swallow
- Barred Antshrike
- Barred Owl
- Barrow's Goldeneye
- Bat Falcon
- Bay-breasted Warbler
- Bay-headed Tanager
- Bay Wren
- Bell's Vireo
- Belted Kingfisher
- Beryl-spangled Tanager
- Berylline Hummingbird
- Bicolored Antbird
- Bicolored Antpitta
- Bicolored Antvireo
- Bicolored Wren
- Black-and-white Owl
- Black-and-white Warbler
- Black-bellied Whistling Duck
- Black-billed Cuckoo
- Black-billed Mountain Toucan
- Black-billed Nightingale-Thrush
- Black-billed Thrush
- Black-breasted Puffbird
- Black-capped Chickadee
- Black-capped Tanager
- Black-cheeked Woodpecker
- Black-chested Jay
- Black-collared Hawk
- Black-cowled Oriole
- Black-crowned Night Heron
- Black-crowned Tanager
- Black-faced Grassquit
- Black-headed Brushfinch
- Black-headed Trogon
- Black-necked Stilt
- Black-throated Blue Warbler
- Black-throated Green Warbler
- Black-throated Mango
- Black-throated Trogon
- Black-whiskered Vireo
- Black-winged Saltator
- Black Flowerpiercer
- Black Phoebe
- Black Tern
- Black Vulture
- Blackburnian Warbler
- Blackpoll Warbler
- Blue-and-black Tanager
- Blue-and-yellow Macaw
- Blue-black Grassquit
- Blue-capped Tanager
- Blue-chested Hummingbird
- Blue-grey Gnatcatcher
- Blue-grey Tanager
- Blue-headed Parrot
- Blue-headed Vireo
- Blue-naped Chlorophonia
- Blue-necked Tanager
- Blue-throated Toucanet
- Blue-winged Mountain Tanager
- Blue-winged Teal
- Blue-winged Warbler
- Blue Bunting
- Blue Dacnis
- Blue Jay
- Bluish-grey Saltator
- Boat-billed Flycatcher
- Boat-billed Heron
- Bobolink
- Bohemian Waxwing
- Bonaparte's Gull
- Boreal Owl
- Broad-billed Motmot
- Broad-billed Tody
- Broad-winged Hawk
- Bronze-tailed Plumeleteer
- Bronzed Cowbird
- Brown-crested Flycatcher
- Brown-headed Cowbird
- Brown-hooded Parrot
- Brown-throated Parakeet
- Brown Creeper
- Brown Inca
- Brown Pelican
- Brown Thrasher
- Brown Violetear
- Buff-tailed Coronet
- Buff-throated Saltator
- Buff-winged Starfrontlet
- Bufflehead
- Buffy Helmetcrest
- Buffy Hummingbird