- Caatinga Cacholote
- Canada Goose
- Canary Islands Chiffchaff
- Cape Bunting
- Cape Crow
- Cape Sparrow
- Cape Starling
- Cape Teal
- Cape Wagtail
- Carib Grackle
- Caribbean Elaenia
- Caribbean Martin
- Carrion Crow
- Caspian Gull
- Cattle Tyrant
- Cetti's Warbler
- Chat Flycatcher
- Chestnut-breasted Mannikin
- Chestnut-headed Oropendola
- Chestnut-sided Warbler
- Chilean Flamingo
- Chinspot Batis
- Chukar Partridge
- Cirl Bunting
- Citril Finch
- Clay-colored Thrush
- Coal Tit
- Cockatiel
- Collared Aracari
- Collared Pratincole
- Common Blackbird
- Common Buzzard
- Common Chaffinch
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Firecrest
- Common Gallinule
- Common Goldeneye
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common House Martin
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Moorhen
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Pochard
- 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 Whitethroat
- Common Wood Pigeon
- Coppery-tailed Coucal
- Corn Bunting
- Creamy-bellied Thrush
- Crested Guan
- Crested Lark
- Crested Tit
- Crimson-breasted Shrike
- Crowned Lapwing