- Calandra Lark
- Canada Goose
- Carrion Crow
- Caspian Gull
- Caspian Tern
- Chiloe Wigeon
- Cinereous Vulture
- Cirl Bunting
- Citrine Wagtail
- Coal Tit
- Collared Flycatcher
- Common Buzzard
- Common Chiffchaff (abietinus)
- Common Crane
- Common Cuckoo
- Common Eider
- Common Goldeneye
- Common Grasshopper Warbler
- Common Greenshank
- Common Gull
- Common Kingfisher
- Common Loon
- Common Merganser
- Common Moorhen
- Common Murre
- Common Nightingale
- Common Pheasant
- Common Pochard
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Ringed Plover
- Common Rosefinch
- Common Sandpiper
- Common Scoter
- Common Starling
- Common Tern
- Common Waxbill
- Corn Bunting
- Corn Crake
- Corsican Finch
- Corsican Nuthatch
- Cream-colored Courser
- Crested Lark
- Crested Tit
- Curlew Sandpiper