- Canada Goose
- Canary Islands Chiffchaff
- Carrion Crow
- Caspian Gull
- Caspian Tern
- Cetti's Warbler
- Chestnut-backed Antbird
- Chestnut-headed Bee-eater
- Chestnut-sided Warbler
- Cinereous Tit
- Cinereous Vulture
- Cinnamon Hummingbird
- Cirl Bunting
- Clay-colored Thrush
- Coal Tit
- Collared Aracari
- Collared Pratincole
- Common Black Hawk
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Eider
- Common Firecrest
- Common Goldeneye
- Common Grackle
- Common Grasshopper Warbler
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- 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 Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tern
- Common Whitethroat
- Common Wood Pigeon
- Corn Bunting
- Cream-colored Courser
- Crested Bobwhite
- Crested Caracara (cheriway)
- Crested Guan
- Crested Lark
- Crested Serpent Eagle
- Crested Tit
- Crowned Lapwing
- Crowned Woodnymph
- Curlew Sandpiper