- Calandra Lark
- California Gull
- California Scrub Jay
- Canada Goose
- Canvasback
- Cape Barren Goose
- Carrion Crow
- Caspian Gull
- Caspian Tern
- Cetti's Warbler
- Chestnut-bellied Sandgrouse
- Chestnut-breasted Mannikin
- Chestnut-cheeked Starling
- Chestnut Bunting
- Chinese Crested Tern
- Chinese Egret
- Chinese Grosbeak
- Chinese Pond Heron
- Chinese Sparrowhawk
- Chowchilla
- Chukar Partridge
- Cinereous Bunting
- Cinereous Vulture
- Cinnamon-breasted Bunting
- Cirl Bunting
- Citril Finch
- Citrine Wagtail
- Clamorous Reed Warbler
- Claudia's Leaf Warbler
- Coal Tit
- Cockatiel
- Collared Aracari
- Collared Finchbill
- Collared Flycatcher
- Collared Owlet
- Collared Pratincole
- Comb-crested Jacana
- Common Blackbird
- Common Buzzard
- Common Chiffchaff
- Common Chiffchaff (tristis)
- Common Crane
- Common Cuckoo
- Common Eider
- Common Firecrest
- Common Gallinule
- Common Goldeneye
- Common Grasshopper Warbler
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Merganser
- Common Moorhen
- Common Myna
- Common Nightingale
- Common Pheasant
- Common Pochard
- Common Quail
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rock Thrush
- Common Rosefinch
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tern
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Common Yellowthroat
- Corn Bunting
- Corn Crake
- Crab-plover
- Cream-colored Courser
- Crested Caracara
- Crested Caracara (cheriway)
- Crested Honey Buzzard
- Crested Lark
- Crested Owl
- Crested Pigeon
- Crested Tit
- Crimson Finch
- Crowned Woodnymph
- Curlew Sandpiper