- Cabot's Tern
- Calandra Lark
- Canada Goose
- Canada Warbler
- Cape May Warbler
- Carrion Crow
- Caspian Tern
- Cedar Waxwing
- Cetti's Warbler
- Chestnut-sided Warbler
- Chiloe Wigeon
- Chipping Sparrow
- Citril Finch
- Coal Tit
- Collared Pratincole
- Common Blackbird
- Common Buzzard
- Common Chiffchaff
- Common Chiffchaff (abietinus)
- Common Chiffchaff (tristis)
- Common Crane
- Common Eider
- Common Firecrest
- Common Goldeneye
- Common Grackle
- Common Gull
- Common Kestrel
- Common Linnet
- Common Loon
- Common Merganser
- Common Moorhen
- Common Myna
- Common Nightingale
- Common Pheasant
- Common Quail
- 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
- Common Yellowthroat
- Cooper's Hawk
- Corn Bunting
- Crested Caracara (cheriway)
- Crested Lark
- Crested Tit
- Curlew Sandpiper