- Canada Goose
- Cetti's Warbler
- Cinereous Vulture
- Common Blackbird
- Common Chiffchaff
- Common Crane
- Common Firecrest
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Merganser
- Common Murre
- Common Pochard
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rock Thrush
- Common Sandpiper
- Common Shelduck
- Common Starling
- Common Tern
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Corn Bunting
- Cory's Shearwater
- Crested Lark
- Curlew Sandpiper