- Bar-headed Goose
- Barn Swallow
- Barnacle Goose
- Barrow's Goldeneye
- Bearded Vulture
- Black-capped Tanager
- Black-collared Starling
- Black-crowned Night Heron
- Black-faced Ibis
- Black-headed Gull
- Black-naped Fruit Dove
- Black-necked Grebe
- Black-necked Stilt
- Black-necked Swan
- Black-winged Red Bishop
- Black-winged Stilt
- Black Hornbill
- Black Kite
- Black Redstart
- Black Swan
- Black Woodpecker
- Blacksmith Lapwing
- Blue-and-yellow Macaw
- Blue-bellied Roller
- Blue-billed Teal
- Blue-black Grassquit
- Blue-faced Parrotfinch
- Blue-throated Macaw
- Blue-throated Piping Guan
- Blue Crane
- Bluethroat
- Blyth's Hornbill
- Brambling
- Brazilian Tanager
- Brazilian Teal
- Brown Wood Owl
- Bufflehead
- Burrowing Parrot
- Bush Stone-curlew