- California Quail
- Canada Goose
- Cape Barren Goose
- Cape Parrot
- Cape Teal
- Capuchinbird
- Carrion Crow
- Cetti's Warbler
- Channel-billed Toucan
- Cheer Pheasant
- Chilean Flamingo
- Chiloe Wigeon
- Cinereous Vulture
- Cirl Bunting
- Coal Tit
- Coconut Lorikeet
- Collared Pratincole
- Collared Scops Owl
- Common Blackbird
- Common Bronzewing
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Emerald Dove
- Common Firecrest
- Common Goldeneye
- Common Greenshank
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Merganser
- Common Moorhen
- 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 Tern
- Common Whitethroat
- Common Wood Pigeon
- Corn Bunting
- Crested Lark
- Crested Partridge
- Crested Pigeon
- Crested Tit
- Crimson-rumped Toucanet
- Croaking Ground Dove
- Curl-crested Aracari
- Curlew Sandpiper