- Canary Islands Chiffchaff
- Cape Gannet
- Cape Starling
- Cape Sugarbird
- Cape Weaver
- Capped Wheatear
- Carrion Crow
- Caspian Tern
- Chestnut-headed Oropendola
- Chestnut-vented Warbler
- Chilean Flamingo
- Clay-colored Thrush
- Coal Tit
- Coconut Lorikeet
- Collared Aracari
- Collared Pratincole
- Collared Whitestart
- Common Blackbird
- Common Buzzard
- Common Chiffchaff
- Common Chlorospingus (ophthalmicus)
- Common Cuckoo
- Common Eider
- Common Greenshank
- Common Gull
- Common Kestrel
- Common Loon
- Common Merganser
- Common Moorhen
- Common Myna
- Common Ostrich
- Common Pochard
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rock Thrush
- Common Sandpiper
- Common Shelduck
- Common Starling
- Common Swift
- Common Tern
- Common Waxbill
- Common Wood Pigeon
- Common Yellowthroat
- Cook's Petrel
- Coppery-headed Emerald
- Coqui Francolin
- Corn Bunting
- Corsican Finch
- Cream-colored Courser
- Crested Francolin
- Crested Guan
- Crested Lark
- Crested Pigeon
- Crested Tit
- Crimson Rosella