- Cackling Goose
- Calandra Lark
- California Quail
- Canada Goose
- Canada Jay
- Cape Barren Goose
- Cape Teal
- Capuchinbird
- Carrion Crow
- Caspian Gull
- Caspian Tern
- Cetti's Warbler
- Chaco Chachalaca
- Channel-billed Toucan
- Cheer Pheasant
- Chestnut-backed Thrush
- Chestnut-bellied Partridge
- Chestnut Teal
- Chilean Flamingo
- Chiloe Wigeon
- Cinereous Vulture
- Cinnamon Ground Dove
- Cinnamon Teal
- Cirl Bunting
- Clark's Nutcracker
- Coal Tit
- Cockatiel
- Coconut Lorikeet
- Collared Kingfisher
- Collared Lory
- Collared Pratincole
- Common Blackbird
- Common Bronzewing
- Common Buzzard
- Common Chaffinch
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Emerald Dove
- Common Firecrest
- Common Goldeneye
- Common Greenshank
- Common Gull
- Common Hill Myna
- Common House Martin
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Redpoll
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Ringed Plover
- Common Sandpiper
- Common Scoter
- Common Shelduck
- Common Snipe
- Common Starling
- Common Tern
- Common Whitethroat
- Common Wood Pigeon
- Coral-billed Ground Cuckoo
- Corn Bunting
- Coscoroba Swan
- Crested Caracara
- Crested Coua
- Crested Lark
- Crested Myna
- Crested Partridge
- Crested Pigeon
- Crested Tit
- Crimson-bellied Parakeet
- Crimson-rumped Toucanet
- Crimson Rosella
- Croaking Ground Dove
- Crowned Lapwing
- Curlew Sandpiper