- Carrion Crow
- Caspian Gull
- Cetti's Warbler
- Chilean Skua
- Chimango Caracara
- Chinstrap Penguin
- Cirl Bunting
- Common Buzzard
- Common Cuckoo
- Common Diving Petrel
- Common Eider
- Common Grackle
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Murre
- Common Pochard
- Common Redshank
- Common Sandpiper
- Common Snipe
- Corn Bunting
- Cory's Shearwater
- Crested Caracara
- Crested Duck