- Caligavis obscura
- Caligavis subfrenata
- Callacanthis
- Callacanthis burtoni
- Callaeas
- Callaeas cinerea
- Callaeas cinereus
- Callaeas wilsoni
- Callaeidae
- Calliope
- Calliope Hummingbird
- Calliope calliope
- Calliope obscura
- Calliope pectardens
- Calliope pectoralis
- Calliope tschebaiewi
- Callipepla
- Callipepla californica
- Callipepla californica brunnescens
- Callipepla douglasii
- Callipepla gambelii
- Callipepla squamata
- Calliphlox
- Calliphlox amethystina
- Calliphlox bryantae
- Calliphlox evelynae
- Calliphlox lyrura
- Calliphlox mitchellii
- Callisitta formosa
- Callithrix jacchus
- Callocephalon
- Callocephalon fimbriatum
- Callonetta
- Callonetta leucophrys
- Calochaetes
- Calochaetes coccineus
- Calocitta
- Calocitta colliei
- Calocitta formosa
- Calocitta formosa pompata
- Caloenas
- Caloenas maculata
- Caloenas nicobarica
- Calonectris
- Calonectris borealis
- Calonectris diomedea
- Calonectris edwardsii
- Calonectris leucomelas
- Caloperdix
- Caloperdix oculea
- Caloperdix oculeus
- Caloramphus
- Caloramphus fuliginosus
- Caloramphus hayii
- Calorhamphus
- Calorhamphus fuliginosus
- Calorhamphus fuliginosus tertius
- Calorhamphus hayii
- Calothorax
- Calothorax lucifer
- Calothorax pulcher
- Calypte
- Calypte anna
- Calypte costae
- Calyptocichla
- Calyptocichla serina
- Calyptocichla serinus
- Calyptomena
- Calyptomena hosii
- Calyptomena viridis
- Calyptomena whiteheadi
- Calyptomenidae
- Calyptophilidae
- Calyptophilus
- Calyptophilus frugivorus
- Calyptophilus tertius
- Calyptorhynchus
- Calyptorhynchus banksii
- Calyptorhynchus banksii macrorhynchus
- Calyptorhynchus baudinii
- Calyptorhynchus funereus
- Calyptorhynchus lathami
- Calyptorhynchus lathami halmaturinus
- Calyptorhynchus latirostris
- Calyptura
- Calyptura cristata
- Camargue
- Camarhynchus
- Camarhynchus crassirostris
- Camarhynchus heliobates
- Camarhynchus pallidus
- Camarhynchus parvulus
- Camarhynchus pauper
- Camarhynchus psittacula
- Camaroptera
- Camaroptera brachyura
- Camaroptera brachyura brevicaudata
- Camaroptera brevicaudata
- Camaroptera brevicaudata transitiva
- Camaroptera chloronota
- Camaroptera harterti
- Camaroptera superciliaris
- Cambodia
- Cambodian Flowerpecker
- Cambodian Laughingthrush
- Cambodian Tailorbird
- Cambridgeshire
- Cameroon
- Cameroon Francolin
- Cameroon Greenbul
- Cameroon Indigobird
- Cameroon Montane Greenbul
- Cameroon Mountain Greenbul
- Cameroon Mountain Robin
- Cameroon Olive-Greenbul
- Cameroon Olive Greenbul
- Cameroon Olive Pigeon
- Cameroon Pigeon
- Cameroon Pipit
- Cameroon Scrub-Warbler
- Cameroon Scrub Warbler
- Cameroon Sombre Greenbul
- Cameroon Speirops
- Cameroon Sunbird
- Camiguin Boobook
- Camiguin Hanging-Parrot
- Camiguin Hanging Parrot
- Camiguin Hawk-Owl
- Camiguin Hawk Owl
- Campbell's Fairywren
- Campbell's Hill Partridge
- Campbell Albatross
- Campbell Island Shag
- Campbell Island Teal
- Campbell Islands Albatross
- Campbell Islands Mollymawk
- Campbell Islands Shag
- Campbell Islands Teal
- Campbell Mollymawk
- Campbell Shag
- Campbell Teal
- Campeche
- Campephaga
- Campephaga Quiscalina
- Campephaga flava
- Campephaga lobata
- Campephaga oriolina
- Campephaga petiti
- Campephaga phoenicea
- Campephaga quiscalina
- Campephagidae
- Campephilus
- Campephilus gayaquilensis
- Campephilus guatemalensis
- Campephilus haematogaster
- Campephilus imperialis
- Campephilus leucopogon
- Campephilus magellanicus
- Campephilus melanoleucos
- Campephilus melanoleucos melanoleucos
- Campephilus melanoleucus
- Campephilus pollens
- Campephilus principalis
- Campephilus robustus
- Campephilus rubricollis
- Campethera
- Campethera Punctuligera
- Campethera abingoni
- Campethera bennettii
- Campethera cailliautii
- Campethera caroli
- Campethera maculosa
- Campethera mombassica
- Campethera nivosa
- Campethera notata
- Campethera nubica
- Campethera punctuligera
- Campethera scriptoricauda
- Campethera tullbergi
- Campicoloides
- Campicoloides bifasciatus
- Campina Jay
- Campo Flicker
- Campo Flicker or Field Flicker
- Campo Miner
- Campo Pipit
- Campo Suiriri
- Campo Troupial
- Campo oriole
- Campochaera
- Campochaera sloetii
- Camptorhynchus labradorius
- Camptostoma
- Camptostoma imberbe
- Camptostoma obsoletum
- Campylopterus
- Campylopterus calcirupicola
- Campylopterus cirrochloris
- Campylopterus curvipennis
- Campylopterus cuvierii
- Campylopterus duidae
- Campylopterus ensipennis
- Campylopterus excellens
- Campylopterus falcatus
- Campylopterus hemileucurus
- Campylopterus hyperythrus
- Campylopterus largipennis
- Campylopterus macrourus
- Campylopterus pampa
- Campylopterus phainopeplus
- Campylopterus rufus
- Campylopterus villaviscensio
- Campylorhamphus
- Campylorhamphus cardosoi
- Campylorhamphus falcularius
- Campylorhamphus gyldenstolpei
- Campylorhamphus procurvoides
- Campylorhamphus pucherani
- Campylorhamphus pusillus
- Campylorhamphus trochilirostris
- Campylorhynchus
- Campylorhynchus albobrunneus
- Campylorhynchus brunneicapillus
- Campylorhynchus capistratus
- Campylorhynchus chiapensis
- Campylorhynchus fasciatus
- Campylorhynchus griseus
- Campylorhynchus gularis
- Campylorhynchus humilis
- Campylorhynchus jocosus
- Campylorhynchus megalopterus
- Campylorhynchus nuchalis
- Campylorhynchus rufinucha
- Campylorhynchus rufinucha capistratus
- Campylorhynchus turdinus
- Campylorhynchus yucatanicus
- Campylorhynchus zonatus
- Cana, Darien Panama(Darien National Park)
- Cana (Darien National Park)
- Canada
- Canada Goose
- Canada Jay
- Canada Warbler
- Canarian Chiffchaff
- Canarian Kinglet
- Canarian Oystercatcher
- Canarian Pigeon
- Canarian Pipit
- Canarian Shearwater
- Canaries
- Canary-winged Finch
- Canary-winged Parakeet
- Canary Blue Tit
- Canary Bowbill
- Canary False-sunbird
- Canary False Sunbird
- Canary Flycatcher
- Canary Flyrobin
- Canary Island Kinglet
- Canary Island Stonechat
- Canary Islands
- Canary Islands Bush Chat
- Canary Islands Chat
- Canary Islands Chiffchaff
- Canary Islands Kinglet
- Canary Islands Oystercatcher
- Canary Islands Stonechat
- Canary Longbill
- Canary White-eye
- Candy Abshier WMA - Hawkwatch Tower(Smith Point, TX)
- Candy Abshier Wildlife Management Area
- Canebrake Groundcreeper
- Canebrake Wren
- Canirallus
- Canirallus beankaensis
- Canirallus kioloides
- Canirallus oculeus
- Canivet's Emerald
- Canivet's or Fork-tailed Emerald
- Canolfan Gwlyptir Genedlaethol Cymry
- Canopy Tower
- Canopy Tower(Panama)
- Cantorchilus
- Cantorchilus elutus
- Cantorchilus griseus
- Cantorchilus guarayanus
- Cantorchilus leucopogon
- Cantorchilus leucotis
- Cantorchilus longirostris
- Cantorchilus modestus
- Cantorchilus nigricapillus
- Cantorchilus semibadius
- Cantorchilus superciliaris
- Cantorchilus thoracicus
- Cantorchilus zeledoni
- Canvasback
- Canyon Canastero
- Canyon Towhee
- Canyon Wren
- Cap Tourmente National Wildlife Area
- Cap de Cavalleria
- Cap de Creus (Cabo de Creus)(Catalonia, Spain)
- Cap de Creus (Cabo de Creus) (Catalonia)
- Cape Barren Goose
- Cape Batis
- Cape Bulbul
- Cape Bunting
- Cape Canary
- Cape Clapper Lark
- Cape Cormorant
- Cape Crombec
- Cape Crow
- Cape Eagle-Owl
- Cape Eagle Owl
- Cape Francolin
- Cape Gannet
- Cape Glossy-Starling
- Cape Glossy Starling
- Cape Grass Warbler
- Cape Grassbird
- Cape Griffon
- Cape Griffon Vulture
- Cape Kaliakra (Nos Kaliakra)
- Cape Kaliakra (Nos Kaliakra) Bulgaria
- Cape Kolka
- Cape Kolka Latvia
- Cape Lark
- Cape Long-billed Lark
- Cape Longclaw
- Cape May
- Cape May Bird Observatory(Goshen , NJ)
- Cape May Bird Observatory (Goshen)
- Cape May Warbler
- Cape Ochiisi
- Cape Parrot
- Cape Penduline-Tit
- Cape Penduline Tit
- Cape Petrel
- Cape Pigeon
- Cape Pygmy-Owl
- Cape Pygmy Owl
- Cape Rail
- Cape Robin-Chat
- Cape Robin Chat
- Cape Rock-Thrush


