- Calandra Lark
- Canary Islands Chiffchaff
- Cape Batis
- Cape Bulbul
- Cape Bunting
- Cape Canary
- Cape Cormorant
- Cape Crow
- Cape Gannet
- Cape Grassbird
- Cape Long-billed Lark
- Cape Longclaw
- Cape Petrel
- Cape Robin-Chat
- Cape Rockjumper
- Cape Shoveler
- Cape Sparrow
- Cape Spurfowl
- Cape Sugarbird
- Cape Teal
- Cape Vulture
- Cape Wagtail
- Cape Weaver
- Cape White-eye
- Capped Wheatear
- Capped White-eye
- Capuchinbird
- Cardinal Woodpecker
- Carib Grackle
- Carrion Crow
- Carunculated Caracara
- Caspian Gull
- Caspian Tern
- Casqued Cacique
- Cassin's Flycatcher
- Cattle Tyrant
- Cave Swallow
- Cave Swiftlet
- Cedar Waxwing
- Cerulean Kingfisher
- Cetti's Warbler
- Changeable Hawk-Eagle
- Channel-billed Toucan
- Charming Hummingbird
- Chestnut-backed Chickadee
- Chestnut-backed Owlet
- Chestnut-backed Sparrow-Lark
- Chestnut-bellied Sandgrouse
- Chestnut-bellied Seedeater
- Chestnut-bellied Starling
- Chestnut-breasted Chlorophonia
- Chestnut-breasted Coronet
- Chestnut-breasted Nigrita
- Chestnut-capped Brushfinch
- Chestnut-capped Flycatcher
- Chestnut-capped Warbler
- Chestnut-collared Swift
- Chestnut-crowned Antpitta
- Chestnut-eared Aracari
- Chestnut-headed Bee-eater
- Chestnut-naped Antpitta
- Chestnut-sided Warbler
- Chestnut-vented Warbler
- Chestnut-winged Chachalaca
- Chestnut-winged Cinclodes
- Chestnut Piculet
- Chestnut Woodpecker
- Chimney Swift
- Chinese Pond Heron
- Choco Toucan
- Chukar Partridge
- Cinereous Becard
- Cinereous Conebill
- Cinereous Tit
- Cinereous Vulture
- Cinnamon-bellied Saltator
- Cinnamon Flycatcher
- Cinnamon Hummingbird
- Citril Finch
- Citrine Wagtail
- Claret-breasted Fruit Dove
- Clay-colored Thrush
- Coal Tit
- Cobalt-rumped Parrotlet
- Cobalt-winged Parakeet
- Cocoa Woodcreeper
- Cocoi Heron
- Collared Antshrike
- Collared Aracari
- Collared Flycatcher
- Collared Gnatwren
- Collared Inca
- Collared Plover
- Collared Pratincole
- Collared Sunbird
- Collared Trogon
- Collared Warbling Finch
- Collared Whitestart
- Common Black Hawk
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Emerald Dove
- Common Firecrest
- Common Gallinule
- Common Goldeneye
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Iora
- Common Kestrel
- Common Kingfisher
- Common Loon
- Common Merganser
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Potoo
- Common Quail
- Common Redpoll
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Ringed Plover
- Common Rock Thrush
- Common Rosefinch
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tailorbird
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Common Whitethroat
- Common Yellowthroat
- Compact Weaver
- Cooper's Hawk
- Coopmans's Tyrannulet
- Coppersmith Barbet
- Coppery-headed Emerald
- Corn Bunting
- Corn Crake
- Corsican Finch
- Cory's Shearwater
- Costa Rican Swift
- Cotton Pygmy Goose
- Crane Hawk
- Cream-colored Courser
- Cream-colored Woodpecker
- Crescent-caped Lophorina
- Crested Bobwhite
- Crested Caracara (cheriway)
- Crested Guan
- Crested Honey Buzzard
- Crested Lark
- Crested Malimbe
- Crested Oropendola
- Crested Serpent Eagle
- Crested Tit
- Crested Treeswift
- Cricket Warbler
- Crimson-backed Flameback
- Crimson-backed Tanager
- Crimson-breasted Finch
- Crimson-collared Tanager
- Crimson-crested Woodpecker
- Crimson-hooded Manakin
- Crimson-mantled Woodpecker
- Crimson-rumped Toucanet
- Crinkle-collared Manucode
- Croaking Ground Dove
- Crowned Cormorant
- Crowned Lapwing
- Crowned Woodnymph
- Curlew Sandpiper
- Cut-throat Finch