- Canada Goose
- Canivet's Emerald
- Cape Barren Goose
- Cape Crow
- Cape May Warbler
- Cardinal Woodpecker
- Carrion Crow
- Carunculated Caracara
- Caspian Gull
- Caspian Tern
- Cetti's Warbler
- Chestnut-bellied Sandgrouse
- Chestnut-breasted Mannikin
- Chestnut-crowned Antpitta
- Chestnut-winged Cinclodes
- Chestnut Sparrow
- Chestnut Teal
- Chestnut Weaver
- Chilean Flamingo
- Choco Toucan
- Choco Trogon
- Choco Warbler
- Cinereous Conebill
- Cinnamon-bellied Saltator
- Cinnamon-breasted Bunting
- Cinnamon-chested Bee-eater
- Cinnamon Becard
- Cinnamon Flycatcher
- Cinnamon Hummingbird
- Citril Finch
- Clay-colored Thrush
- Coal Tit
- Collared Aracari
- Collared Inca
- Collared Pratincole
- Collared Trogon
- Common Black Hawk
- Common Blackbird
- Common Bronzewing
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Goldeneye
- Common Greenshank
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Moorhen
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Potoo
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rock Thrush
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Comoro Blue Pigeon
- Comoro Fody
- Comoro Olive Pigeon
- Coqui Francolin
- Corn Bunting
- Couch's Kingbird
- Crescent Honeyeater
- Crested Caracara
- Crested Francolin
- Crested Pigeon
- Crested Tit
- Crimson-rumped Toucanet
- Crimson Rosella
- Crowned Chat-Tyrant
- Crowned Lapwing
- Crowned Woodnymph
- Cryptic Becard
- Cuckoo-roller
- Curlew Sandpiper
- Curve-winged Sabrewing
- Cut-throat Finch
- Cyprus Wheatear