- Bar-tailed Godwit
- Bare-necked Fruitcrow
- Bare-throated Tiger Heron
- Barn Swallow
- Barred Becard
- Bay-headed Tanager
- Black-and-white Owl
- Black-banded Woodcreeper
- Black-bellied Whistling Duck
- Black-browed Albatross
- Black-cheeked Woodpecker
- Black-cowled Oriole
- Black-faced Dacnis
- Black-faced Solitaire
- Black-fronted Nunbird
- Black-headed Gull
- Black-necked Grebe
- Black-necked Stilt
- Black-thighed Grosbeak
- Black-winged Stilt
- Black Caracara
- Black Guan
- Black Kite
- Black Redstart
- Black Solitaire
- Black Swan
- Black Vulture
- Blue-and-yellow Macaw
- Blue-backed Conebill
- Blue-footed Booby
- Blue-grey Tanager
- Blue-necked Tanager
- Bluethroat
- Brambling
- Brant Goose
- Bronzy Hermit
- Brown-bellied Swallow
- Brown Jay
- Brown Teal
- Buff-banded Rail
- Buff-tailed Coronet
- Buff-throated Saltator
- Buff-throated Woodcreeper
- Buller's Albatross