- Berlepsch's Gnatcatcher
- Berlepsch's Tinamou
- Bermuda Night-Heron
- Bermuda Petrel
- Bermuda Towhee
- Bernier's Teal
- Bernier's Vanga
- Bernieria
- Berryeater
- Berrypecker
- Berrypecker (genus)
- Bertha's Coua
- Berthelot's Pipit
- Bertoni's Antbird
- Beryl-spangled Tanager
- Berylline Hummingbird
- Beryllium
- Besra
- Betsile Elephant Bird
- Bewick's Swan
- Bewick's Wren
- Bhutan Laughingthrush
- Biak Black Flycatcher
- Biak Coucal
- Biak Gerygone
- Biak Lorikeet
- Biak Monarch
- Biak Paradise-Kingfisher
- Biak Scops-Owl
- Biak Scrubfowl
- Biak Tree Monitor
- Biak White-eye
- Bianchi's Warbler
- Bib
- Bicknell's Thrush
- Bicoloured Antbird
- Bicoloured Antpitta
- Bicoloured Antvireo
- Bicoloured Conebill
- Bicoloured Flowerpecker
- Bicoloured Hawk
- Bicoloured Mouse-warbler
- Bicoloured Wren
- Biddulph's Ground Jay
- Big-eared Kangaroo Rat
- Big Bang
- Bigeye Thresher
- Bigeyed Sixgill Shark
- Bignose Shark
- Bikont
- Bilateria
- Bill
- Bimaculated Lark
- Binomial nomenclature
- Biodiversity
- Biological Journal of the Linnean Society
- Biological classification
- Bioluminescence
- Biome
- Bipedalism
- Bird
- Bird-of-paradise
- Bird-of-paradise (disambiguation)
- Bird: The Definitive Visual Guide
- BirdLife International
- Bird Songs from Around the World (book)
- Bird anatomy
- Bird behaviour
- Bird colony
- Bird diets
- Bird egg
- Bird flight
- Bird habitats
- Bird hybrid
- Bird intelligence
- Bird migration
- Bird nest
- Bird of prey
- Bird records
- Bird reproduction
- Bird senses
- Bird song
- Bird species new to science described in the 2000s
- Bird topography
- Bird vocalization
- Birds of Australia (book)
- Birds of Kenya and Northern Tanzania (book)
- Birds of Maharashtra (book)
- Birds of the World (book)
- Biscutate Swift
- Bishop's Oo
- Bismarck Black Myzomela
- Bismarck Crow
- Bismarck Fantail
- Bismarck Hanging-Parrot
- Bismarck Hawk-Owl
- Bismarck Kingfisher
- Bismarck Pitta
- Bismarck Whistler
- Bismarck White-eye
- Bismuth
- Bitter Beech Bolete
- Bittern
- Black-and-buff Woodpecker
- Black-and-chestnut Eagle
- Black-and-chestnut Warbling-Finch
- Black-and-cinnamon Fantail
- Black-and-crimson Oriole
- Black-and-gold Cotinga
- Black-and-gold Tanager
- Black-and-orange Flycatcher
- Black-and-red Broadbill
- Black-and-rufous Swallow
- Black-and-rufous Warbling-Finch
- Black-and-tawny Seedeater
- Black-and-white-casqued Hornbill
- Black-and-white Antbird
- Black-and-white Becard
- Black-and-white Bulbul
- Black-and-white Hawk-Eagle
- Black-and-white Mannikin
- Black-and-white Monjita
- Black-and-white Owl
- Black-and-white Seedeater
- Black-and-white Shrike-flycatcher
- Black-and-white Tanager
- Black-and-white Thrush
- Black-and-white Tody-Flycatcher
- Black-and-white Triller
- Black-and-white Warbler
- Black-and-yellow Broadbill
- Black-and-yellow Grosbeak
- Black-and-yellow Silky-flycatcher
- Black-and-yellow Tanager
- Black-and-yellow broadbill
- Black-backed Antshrike
- Black-backed Barbet
- Black-backed Bittern
- Black-backed Bush-tanager
- Black-backed Bush Tanager
- Black-backed Butcherbird
- Black-backed Cisticola
- Black-backed Forktail
- Black-backed Grosbeak
- Black-backed Jackal
- Black-backed Kingfisher
- Black-backed Oriole
- Black-backed Puffback
- Black-backed Swamphen
- Black-backed Tanager
- Black-backed Thornbill
- Black-backed Thrush
- Black-backed Tody-Flycatcher
- Black-backed Wagtail
- Black-backed Water-Tyrant
- Black-backed Woodpecker
- Black-banded Barbet
- Black-banded Crake
- Black-banded Flycatcher
- Black-banded Fruit-Dove
- Black-banded Owl
- Black-banded Woodcreeper
- Black-bellied Antwren
- Black-bellied Bustard
- Black-bellied Cicadabird
- Black-bellied Cuckoo
- Black-bellied Cuckooshrike
- Black-bellied Firefinch
- Black-bellied Gnateater
- Black-bellied Hummingbird
- Black-bellied Malkoha
- Black-bellied Myzomela
- Black-bellied Sandgrouse
- Black-bellied Seedcracker
- Black-bellied Seedeater
- Black-bellied Starling
- Black-bellied Storm-Petrel
- Black-bellied Sunbird
- Black-bellied Tanager
- Black-bellied Tern
- Black-bellied Thorntail
- Black-bellied Whistling Duck
- Black-bellied Wren
- Black-belted Flowerpecker
- Black-bibbed Cicadabird
- Black-bibbed Monarch
- Black-bibbed Tit
- Black-billed Amazon
- Black-billed Barbet
- Black-billed Brushturkey
- Black-billed Capercaillie
- Black-billed Coucal
- Black-billed Cuckoo
- Black-billed Flycatcher
- Black-billed Gull
- Black-billed Koel
- Black-billed Magpie
- Black-billed Mountain-Toucan
- Black-billed Nightingale-Thrush
- Black-billed Peppershrike
- Black-billed Scythebill
- Black-billed Seed-Finch
- Black-billed Shrike-Tyrant
- Black-billed Sicklebill
- Black-billed Streamertail
- Black-billed Thrush
- Black-billed Treehunter
- Black-billed Turaco
- Black-billed Wood-Dove
- Black-billed Woodhoopoe
- Black-bodied Woodpecker
- Black-breasted Barbet
- Black-breasted Boatbill
- Black-breasted Buttonquail
- Black-breasted Buzzard
- Black-breasted Hillstar
- Black-breasted Munia
- Black-breasted Myzomela
- Black-breasted Parrotbill
- Black-breasted Puffbird
- Black-breasted Puffleg
- Black-breasted Thrush
- Black-breasted Weaver
- Black-breasted Wood-Quail
- Black-browed Albatross
- Black-browed Babbler
- Black-browed Barbet
- Black-browed Fulvetta
- Black-browed Reed-Warbler
- Black-browed Tit
- Black-browed Triller
- Black-capped Antwren
- Black-capped Apalis
- Black-capped Babbler
- Black-capped Becard
- Black-capped Bulbul
- Black-capped Chickadee
- Black-capped Donacobius
- Black-capped Flycatcher
- Black-capped Foliage-gleaner
- Black-capped Gnatcatcher
- Black-capped Hemispingus
- Black-capped Kingfisher
- Black-capped Lory
- Black-capped Parakeet
- Black-capped Petrel
- Black-capped Piprites
- Black-capped Pygmy-Tyrant
- Black-capped Screech-Owl
- Black-capped Siskin
- Black-capped Social-Weaver
- Black-capped Sparrow
- Black-capped Speirops
- Black-capped Swallow
- Black-capped Tanager
- Black-capped Tinamou
- Black-capped Tyrannulet
- Black-capped Vireo
- Black-capped Warbling-Finch
- Black-capped White-eye
- Black-capped Woodland-Warbler
- Black-casqued Hornbill
- Black-cheeked Ant-Tanager
- Black-cheeked Gnateater
- Black-cheeked Lovebird
- Black-cheeked Mountain-Tanager
- Black-cheeked Warbler
- Black-cheeked Waxbill
- Black-cheeked Woodpecker
- Black-chested Buzzard-Eagle
- Black-chested Fruiteater
- Black-chested Honeyeater
- Black-chested Jay
- Black-chested Mountain-Tanager
- Black-chested Prinia
- Black-chested Snake-Eagle
- Black-chested Sparrow
- Black-chested Tyrant
- Black-chinned Antbird
- Black-chinned Babbler
- Black-chinned Fruit-Dove
- Black-chinned Honeyeater
- Black-chinned Hummingbird
- Black-chinned Laughingthrush
- Black-chinned Monarch
- Black-chinned Mountain-Tanager
- Black-chinned Quailfinch
- Black-chinned Robin
- Black-chinned Siskin
- Black-chinned Sparrow
- Black-chinned Whistler
- Black-chinned Yuhina
- Black-collared Apalis
- Black-collared Barbet
- Black-collared Bulbul
- Black-collared Hawk
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