- Cranioleuca antisiensis
- Cranioleuca baroni
- Cranioleuca curtata
- Cranioleuca demissa
- Cranioleuca dissita
- Cranioleuca erythrops
- Cranioleuca gutturata
- Cranioleuca hellmayri
- Cranioleuca henricae
- Cranioleuca marcapatae
- Cranioleuca muelleri
- Cranioleuca obsoleta
- Cranioleuca pallida
- Cranioleuca pyrrhophia
- Cranioleuca semicinerea
- Cranioleuca subcristata
- Cranioleuca sulphurifera
- Cranioleuca vulpecula
- Cranioleuca vulpina
- Crater Lakes National Park
- Crateroscelis
- Crateroscelis murina
- Crateroscelis nigrorufa
- Crateroscelis robusta
- Craveri's Murrelet
- Crax
- Crax alberti
- Crax alector
- Crax blumenbachii
- Crax daubentoni
- Crax fasciolata
- Crax globulosa
- Crax rubra
- Creadion
- Creadion carunculatus
- Creagrus
- Creagrus furcatus
- Cream-backed Woodpecker
- Cream-bellied Fruit-Dove
- Cream-bellied Fruit Dove
- Cream-bellied Munia
- Cream-breasted Fruit-Dove
- Cream-breasted Fruit Dove
- Cream-browed Ibon
- Cream-browed White-eye
- Cream-colored Courser
- Cream-colored Woodpecker
- Cream-coloured Courser
- Cream-coloured Woodpecker
- Cream-eyed Bulbul
- Cream-striped Bulbul
- Cream-throated White-eye
- Cream-vented Bulbul
- Cream-winged Cinclodes
- Creamy-bellied Antwren
- Creamy-bellied Gnatcatcher
- Creamy-bellied Thrush
- Creamy-breasted Canastero
- Creamy-browed Ibon
- Creamy-crested Spinetail
- Creamy-rumped Miner
- Creamy-throated White-eye
- Creatophora
- Creatophora Cinerea
- Creatophora cinerea
- Crecopsis
- Crecopsis egregia
- Crescent-chested Babbler
- Crescent-chested Puffbird
- Crescent-chested Tree-babbler
- Crescent-chested Warbler
- Crescent-faced Antpitta
- Crescent Honeyeater
- Crescentchests
- Cressida cressida
- Crested-Tinamou
- Crested Ant-Tanager
- Crested Ant Tanager
- Crested Argus
- Crested Argus Pheasant
- Crested Auklet
- Crested Barbet
- Crested Baza
- Crested Becard
- Crested Bellbird
- Crested Berrypecker
- Crested Bird-of-Paradise
- Crested Bird-of-paradise
- Crested Bird of Paradise
- Crested Black-Tyrant
- Crested Black Tyrant
- Crested Bobwhite
- Crested Bowerbird
- Crested Bunting
- Crested Caracara
- Crested Cnemophilus
- Crested Coot
- Crested Coua
- Crested Cuckoo-Dove
- Crested Cuckoo Dove
- Crested Doradito
- Crested Drongo
- Crested Duck
- Crested Eagle
- Crested Finchbill
- Crested Fireback
- Crested Fireback Pheasant
- Crested Foliage-gleaner
- Crested Francolin
- Crested Gallito
- Crested Gardenerbird
- Crested Goshawk
- Crested Guan
- Crested Guineafowl
- Crested Hawk
- Crested Hawk-Eagle
- Crested Hawk Eagle
- Crested Honey-Buzzard
- Crested Honey Buzzard
- Crested Hornero
- Crested Ibis
- Crested Ibon
- Crested Jay
- Crested King Myna
- Crested Kingfisher
- Crested Lark
- Crested Madagascar Coucal
- Crested Malimbe
- Crested Myna
- Crested Mynah
- Crested Olive Bulbul
- Crested Oreoica
- Crested Oropendola
- Crested Owl
- Crested Parrotbill
- Crested Partridge
- Crested Pigeon
- Crested Pitohui
- Crested Quail-Dove
- Crested Quail Dove
- Crested Quetzal
- Crested Satinbird
- Crested Serpent-Eagle
- Crested Serpent Eagle
- Crested Shelduck
- Crested Shrike-Jay
- Crested Shrike-tit
- Crested Shrike Jay
- Crested Shriketit
- Crested Spinetail
- Crested Tinamou
- Crested Tit
- Crested Tit-Warbler
- Crested Tit Warbler
- Crested Treeswift
- Crested White-eye
- Crested Wood-shrike
- Crested Wood Partridge
- Crested serpent Eagle
- Crestless Bowerbird
- Crestless Curassow
- Crestless Fireback
- Crestless Fireback Pheasant
- Crestless Gardener
- Crete
- Cretschmar's Babbler
- Cretzschmar's Babbler
- Cretzschmar's Bunting
- Creurgops
- Creurgops dentata
- Creurgops verticalis
- Crex
- Crex crex
- Crex egregia
- Cricket Longtail
- Cricket Warbler
- Crimson-backed Flameback
- Crimson-backed Forest-finch
- Crimson-backed Forest Finch
- Crimson-backed Forestfinch
- Crimson-backed Goldenback
- Crimson-backed Sunbird
- Crimson-backed Tanager
- Crimson-bellied Parakeet
- Crimson-bellied Woodpecker
- Crimson-breasted Barbet
- Crimson-breasted Finch
- Crimson-breasted Flowerpecker
- Crimson-breasted Gonolek
- Crimson-breasted Shrike
- Crimson-breasted Woodpecker
- Crimson-browed Finch
- Crimson-collared Grosbeak
- Crimson-collared Tanager
- Crimson-crested Woodpecker
- Crimson-crowned Flowerpecker
- Crimson-crowned Fruit-Dove
- Crimson-crowned Fruit Dove
- Crimson-faced Liocichla
- Crimson-fronted Barbet
- Crimson-fronted Cardinal
- Crimson-fronted Myzomela
- Crimson-fronted Parakeet
- Crimson-headed Partridge
- Crimson-hooded Manakin
- Crimson-hooded Myzomela
- Crimson-mantled Woodpecker
- Crimson-rumped Myzomela
- Crimson-rumped Toucanet
- Crimson-rumped Waxbill
- Crimson-winged Finch
- Crimson-winged Laughingthrush
- Crimson-winged Woodpecker
- Crimson Chat
- Crimson Finch
- Crimson Finch Tanager
- Crimson Fruitcrow
- Crimson Rosefinch
- Crimson Rosella
- Crimson Rumped Toucanet
- Crimson Seedcracker
- Crimson Shining-Parrot
- Crimson Shining Parrot
- Crimson Sunbird
- Crimson Topaz
- Crinifer
- Crinifer piscator
- Crinifer zonurus
- Criniferoides leucogaster
- Criniger
- Criniger barbatus
- Criniger calurus
- Criniger chloronotus
- Criniger ndussumensis
- Criniger olivaceus
- Criniger pallidus
- Crinkle-breasted Manucode
- Crinkle-collared Manucode
- Crissal Thrasher
- Crithagra
- Crithagra alario
- Crithagra albogularis
- Crithagra ankoberensis
- Crithagra atrogularis
- Crithagra buchanani
- Crithagra burtoni
- Crithagra canicapilla
- Crithagra capistrata
- Crithagra citrinelloides
- Crithagra citrinipecta
- Crithagra citrinipectus
- Crithagra concolor
- Crithagra donaldsoni
- Crithagra dorsostriata
- Crithagra dorsostriatus
- Crithagra flavigula
- Crithagra flaviventris
- Crithagra frontalis
- Crithagra gularis
- Crithagra hyposticta
- Crithagra koliensis
- Crithagra leucoptera
- Crithagra leucopterus
- Crithagra leucopygia
- Crithagra melanochroa
- Crithagra menachensis
- Crithagra mennelli
- Crithagra mozambica
- Crithagra reichardi
- Crithagra reichenowi
- Crithagra rothschildi
- Crithagra rothschilidi
- Crithagra rufobrunnea
- Crithagra scotops
- Crithagra striatipectus
- Crithagra striolata
- Crithagra striolatus
- Crithagra sulphurata
- Crithagra symonsi
- Crithagra totta
- Crithagra tristriata
- Crithagra tristriatus
- Crithagra whytii
- Crithagra xantholaema
- Crithagra xanthopygia
- Croaking Cisticola
- Croaking Ground-Dove
- Croaking Ground Dove
- Croatia
- Crocias
- Crocias albonotatus
- Crocias guttatus
- Crocias langbianis
- Crocodile-bird
- Crossley's Babbler
- Crossley's Ground-Thrush
- Crossley's Ground Thrush
- Crossley's Vanga
- Crossleyia
- Crossleyia xanthophrys
- Crossoptilon
- Crossoptilon auritum
- Crossoptilon crossoptilon
- Crossoptilon crossoptilon harmani
- Crossoptilon harmani
- Crossoptilon mantchuricum
- Crotophaga
- Crotophaga ani
- Crotophaga major
- Crotophaga sulcirostris
- Crotophagidae
- Crow
- Crow-billed Drongo
- Crow Honeyeater
- Crow pheasant
- Crowned Chat-Tyrant
- Crowned Chat Tyrant
- Crowned Cormorant
- Crowned Eagle
- Crowned Hawk-Eagle
- Crowned Hawk Eagle
- Crowned Hornbill
- Crowned Lapwing
- Crowned Penduline-tit
- Crowned Penduline Tit
- Crowned Plover
- Crowned Sandgrouse
- Crowned Slaty-Flycatcher
- Crowned Slaty Flycatcher
- Crowned Solitary Eagle
- Crowned Woodnymph
- Crows
- Crozet Shag
- Crypsirina
- Crypsirina cucullata
- Crypsirina temia
- Cryptic/Such's Antthrush
- Cryptic Antthrush
- Cryptic Flycatcher
- Cryptic Forest-Falcon
- Cryptic Forest Falcon
- Cryptic Treehunter
- Cryptic Warbler
- Cryptillas
- Cryptillas victorini


