- California Gull
- California Towhee
- Canada Goose
- Canada Jay
- Carib Grackle
- Caribbean Martin
- Carrion Crow
- Caspian Tern
- Cassin's Finch
- Cedar Waxwing
- Cetti's Warbler
- Chaco Chachalaca
- Chestnut-backed Chickadee
- Chestnut-fronted Macaw
- Chiguanco Thrush
- Chilean Flamingo
- Chilean Swallow
- Chilean Tinamou
- Chiloe Wigeon
- Chimango Caracara
- Chipping Sparrow
- Cinnamon Teal
- Cirl Bunting
- Citril Finch
- Clark's Grebe
- Clark's Nutcracker
- Coal Tit
- Cockatiel
- Cocoi Heron
- Collared Plover
- Comb Duck
- Common Blackbird
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Eider
- Common Firecrest
- Common Gallinule
- Common Goldeneye
- Common Grackle
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Merganser
- Common Miner
- Common Moorhen
- Common Murre
- Common Myna
- Common Pheasant
- Common Pochard
- Common Redpoll
- 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
- Coscoroba Swan
- Cream-winged Cinclodes
- Crested Caracara
- Crested Duck
- Crested Tit
- Croaking Ground Dove
- Cuban Amazon