- Bush Stone Curlew
- Bush Thick-knee
- Bush Wren
- Bushcrow
- Bushtit
- Bushveld Pipit
- Bushwren
- Bushy-crested Hornbill
- Bushy-crested Jay
- Bushy Point(Invercargill -Southland)
- Buskett and Wied il-Luq Bird Sanctuary
- Buskett and Wied il-Luq Bird Sanctuary Malta
- Bustard
- Bustard Quail
- Bustard protection area Buckow(Berlin/ Brandenburg)
- Bustards
- Butastur
- Butastur indicus
- Butastur liventer
- Butastur rufipennis
- Butastur teesa
- Butembo Greenbul
- Buteo
- Buteo Buteo
- Buteo albicaudatus
- Buteo albigula
- Buteo albonotatus
- Buteo archeri
- Buteo augur
- Buteo auguralis
- Buteo bannermani
- Buteo brachypterus
- Buteo brachyurus
- Buteo brachyurus brachyurus
- Buteo burmanicus
- Buteo buteo
- Buteo buteo rothschildi
- Buteo buteo vulpinus
- Buteo galapagoensis
- Buteo hemilasius
- Buteo jamaicensis
- Buteo jamaicensis calurus
- Buteo jamaicensis fuertesi
- Buteo jamaicensis harlani
- Buteo japonicus
- Buteo japonicus japonicus
- Buteo lagopus
- Buteo leucorrhous
- Buteo lineatus
- Buteo lineatus alleni
- Buteo lineatus elegans
- Buteo magnirostris
- Buteo magnirostris griseocaudata
- Buteo nitidus
- Buteo nitidus nitidus
- Buteo oreophilus
- Buteo plagiatus
- Buteo platypterus
- Buteo platypterus antillarum
- Buteo poecilochrous
- Buteo polyosoma
- Buteo refectus
- Buteo regalis
- Buteo ridgwayi
- Buteo rufinus
- Buteo rufofuscus
- Buteo socotraensis
- Buteo solitarius
- Buteo swainsoni
- Buteo trizonatus
- Buteo ventralis
- Buteogallus
- Buteogallus aequinoctialis
- Buteogallus anthracinus
- Buteogallus anthracinus anthracinus
- Buteogallus anthracinus subtilis
- Buteogallus anthracinus utilensis
- Buteogallus coronatus
- Buteogallus gundlachii
- Buteogallus lacernulatus
- Buteogallus meridionalis
- Buteogallus schistaceus
- Buteogallus solitarius
- Buteogallus subtilis
- Buteogallus urubitinga
- Buteogallus urubitinga ridgwayi
- Buteogallus urubitinga urubitinga
- Buthraupis
- Buthraupis aureodorsalis
- Buthraupis eximia
- Buthraupis montana
- Buthraupis wetmorei
- Buton Myna
- Buton Starling
- Butorides
- Butorides Striata
- Butorides striata
- Butorides striata atricapilla
- Butorides striata striata
- Butorides striatus
- Butorides striatus macrorhyncha
- Butorides sundevalli
- Butorides virescens
- Button Quail
- Button Quails
- Buttonquail
- Buttonquails
- Butung Hornbill
- Buzzard
- Buzzard-Eagle
- Buzzard-Eagles
- Buzzard Eagle
- Buzzard Eagles
- Buzzards
- Buzzing Flowerpecker
- Bycanistes
- Bycanistes albotibialis
- Bycanistes brevis
- Bycanistes bucinator
- Bycanistes cylindrica
- Bycanistes cylindricus
- Bycanistes fistulator
- Bycanistes subcylindrica
- Bycanistes subcylindricus
- Böhm's Bee-eater
- Böhm's Flycatcher
- Böhm's Spinetail
- Böhm's Spinetailed Swift
- Büttikofer's Babbler
- C90 Mak
- CA
- CARACARA CHERIWAY
- CHARADRIUS SEMIPALMATUS
- CONSERVATION AREA(STEEPLE MORDEN)
- Caatinga Antwren
- Caatinga Black-Tyrant
- Caatinga Black Tyrant
- Caatinga Cachalote
- Caatinga Cacholote
- Caatinga Gnateater
- Caatinga Nighthawk
- Caatinga Parakeet
- Cabalus modestus
- Cabani's Wren
- Cabanis' Bunting
- Cabanis's Bunting
- Cabanis's Greenbul
- Cabanis's Ground-Sparrow
- Cabanis's Ground Sparrow
- Cabanis's Seedeater
- Cabanis's Spinetail
- Cabanis's Tanager
- Cabanis's Wren
- Cabbage White
- Cable John Cove(Bonavista)
- Cabo de Santa Pola
- Cabo de Santa Pola Spain
- Cabot's Tern
- Cabot's Tragopan
- Cacatua
- Cacatua alba
- Cacatua ducorpsii
- Cacatua galerita
- Cacatua galerita galerita
- Cacatua goffini
- Cacatua goffiniana
- Cacatua haematuropygia
- Cacatua leadbeateri
- Cacatua moluccensis
- Cacatua ophthalmica
- Cacatua pastinator
- Cacatua roseicapilla
- Cacatua roseicapillus
- Cacatua sanguinea
- Cacatua sanguinea sanguinea
- Cacatua sanguinea westralensis
- Cacatua sulphurea
- Cacatua tenuirostris
- Cacatuidae
- Caceres-Trujillo Steppes
- Caceres-Trujillo Steppes Spain
- Cachar Bulbul
- Cachar Wedge-billed Babbler
- Cachar Wedge-billed Wren-Babbler
- Cachar Wedge-billed Wren Babbler
- Cacicus
- Cacicus cela
- Cacicus cela cela
- Cacicus chrysonotus
- Cacicus chrysopterus
- Cacicus haemorrhous
- Cacicus koepckeae
- Cacicus latirostris
- Cacicus leucoramphus
- Cacicus melanicterus
- Cacicus microrhynchus
- Cacicus oseryi
- Cacicus sclateri
- Cacicus solitarius
- Cacicus uropygialis
- Cackling Goose
- Cacomantia sepulcralis
- Cacomantis
- Cacomantis aeruginosus
- Cacomantis castaneiventris
- Cacomantis flabelliformis
- Cacomantis heinrichi
- Cacomantis leucolophus
- Cacomantis merulinus
- Cacomantis pallidus
- Cacomantis passerinus
- Cacomantis sepulcralis
- Cacomantis sonneratii
- Cacomantis variolosus
- Cacomantis variolosus sepulcralis
- Cactus Canastero
- Cactus Finch
- Cactus Ground-Finch
- Cactus Ground Finch
- Cactus Groundfinch
- Cactus Parakeet
- Cactus Wren
- Caddo Lake
- Caddo Lake State Park
- Caddo Lake State Park(Caddo Lake)
- Cadiz Lagoons
- Cadiz Lagoons (Spain)
- Caerlaverock
- Caerlaverock Wetland Centre
- Cahow
- Caica Parrot
- Caiman Lodge
- Caiman Lodge(South Pantanal)
- Cairina
- Cairina moschata
- Cairina scutulata
- Cairngorm
- Cairngorms
- Cairngorms National Park
- Cairns
- Cala Tirant
- Calamanthus
- Calamanthus campestris
- Calamanthus cautus
- Calamanthus cautus cauta
- Calamanthus fuliginosus
- Calamanthus fuliginosus albiloris
- Calamanthus montanellus
- Calamanthus pyrrhopygius
- Calamonastes
- Calamonastes fasciolatus
- Calamonastes simplex
- Calamonastes stierlingi
- Calamonastes undosus
- Calamonastides
- Calamonastides gracilirostris
- Calamospiza
- Calamospiza melanocorys
- Calandra Lark
- Calandrella
- Calandrella acutirostris
- Calandrella athensis
- Calandrella blanfordi
- Calandrella brachydactyla
- Calandrella cheleensis
- Calandrella cinerea
- Calandrella dukhunensis
- Calandrella eremica
- Calandrella erlangeri
- Calandrella raytal
- Calandrella raytal krishnarkumarsinhji
- Calandrella rufescens
- Calandrella somalica
- Calayan Rail
- Calcariidae
- Calcarius
- Calcarius lapponicus
- Calcarius mccownii
- Calcarius ornatus
- Calcarius pictus
- Calendulauda
- Calendulauda africanoides
- Calendulauda albescens
- Calendulauda alopex
- Calendulauda barlowi
- Calendulauda burra
- Calendulauda erythrochlamys
- Calendulauda poecilosterna
- Calendulauda sabota
- Calfbird
- Calicalicus
- Calicalicus madagascariensis
- Calicalicus rufocarpalis
- Calidris
- Calidris Maritima
- Calidris Minuta
- Calidris Pugnax
- Calidris Subminuta
- Calidris Virgata
- Calidris acuminata
- Calidris alba
- Calidris alpina
- Calidris alpina arcticola
- Calidris alpina pacifica
- Calidris bairdii
- Calidris canutus
- Calidris canutus piersmai
- Calidris falcinellus
- Calidris ferruginea
- Calidris fuscicollis
- Calidris himantopus
- Calidris maritima
- Calidris mauri
- Calidris melanotos
- Calidris minuta
- Calidris minutilla
- Calidris ptilocnemis
- Calidris ptilocnemis tschuktschorum
- Calidris pugnax
- Calidris pusilla
- Calidris pygmea
- Calidris pygmeus
- Calidris ruficollis
- Calidris subminuta
- Calidris subruficollis
- Calidris temminckii
- Calidris tenuirostris
- Calidris virgata
- Caliechthrus
- Caliechthrus leucolophus
- California
- California Condor
- California Gnatcatcher
- California Gull
- California Jay
- California Pygmy-Owl
- California Pygmy Owl
- California Quail
- California Scrub-Jay
- California Scrub Jay
- California Thrasher
- California Towhee
- Californian Gull
- Californian Nuthatch
- Caligavis


