- Cactus Wren
- Calandra Lark
- California Condor
- California Gull
- California Quail
- California Scrub Jay
- California Thrasher
- California Towhee
- Canyon Towhee
- Cape Barren Goose
- Caspian Tern
- Chestnut-backed Sparrow-Lark
- Chestnut-bellied Sandgrouse
- Chestnut-bellied Starling
- Chestnut-breasted Mannikin
- Chestnut Teal
- Cinereous Vulture
- Clark's Grebe
- Coal Tit
- Coconut Lorikeet
- Collared Flycatcher
- Collared Pratincole
- Common Blackbird
- Common Bronzewing
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Diving Petrel
- Common Eider
- Common Firecrest
- Common Grasshopper Warbler
- Common Greenshank
- Common Kingfisher
- Common Linnet
- Common Moorhen
- Common Murre
- Common Myna
- Common Nightingale
- Common Pochard
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Sandpiper
- Common Snipe
- Common Starling
- Common Swift
- Common Tern
- Common Whitethroat
- Common Wood Pigeon
- Corn Bunting
- Cream-colored Courser
- Crested Lark
- Crested Pigeon
- Crimson Rosella
- Curlew Sandpiper
- Cut-throat Finch