- California Gull
- Cape Teal
- Caspian Gull
- Caspian Tern
- Cave Swallow
- Cinnamon Teal
- Clark's Grebe
- Coal Tit
- Common Black Hawk
- Common Blackbird
- Common Buzzard
- Common Eider
- Common Goldeneye
- Common Grackle
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Merganser
- Common Moorhen
- Common Murre
- Common Nightingale
- Common Pheasant
- Common Pochard
- Common Redshank
- Common Reed Warbler
- Common Ringed Plover
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Starling
- Common Tern
- Common Wood Pigeon
- Corn Bunting
- Costa's Hummingbird
- Crested Caracara
- Crested Lark
- Crested Pigeon