- Canada Goose
- Carib Grackle
- Caribbean Elaenia
- Carrion Crow
- Caspian Gull
- Caspian Tern
- Cetti's Warbler
- Chalk-browed Mockingbird
- Chestnut-bellied Sandgrouse
- Chilean Flamingo
- Chimango Caracara
- Chukar Partridge
- Cinereous Harrier
- Cinereous Vulture
- Cinnamon-bellied Ground Tyrant
- Cirl Bunting
- Clay-colored Thrush
- Coal Tit
- Collared Pratincole
- Collared Sunbird
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Firecrest
- Common Gallinule
- Common Goldeneye
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Sandpiper
- Common Scimitarbill
- Common Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tern
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Corn Bunting
- Correndera Pipit
- Corsican Finch
- Cory's Shearwater
- Couch's Kingbird
- Crab-plover
- Crested Duck
- Crested Francolin
- Crested Lark
- Crested Tit
- Crowned Lapwing
- Curlew Sandpiper
- Cut-throat Finch
- Cyprus Warbler