- Campo Flicker
- Canada Goose
- Cape Bulbul
- Cape Cormorant
- Cape Gannet
- Cape Robin-Chat
- Cape Sparrow
- Cape Spurfowl
- Cape Starling
- Cape Sugarbird
- Cape Teal
- Cape Wagtail
- Cape Weaver
- Capped Heron
- Caspian Tern
- Cedar Waxwing
- Chalk-browed Mockingbird
- Chestnut-eared Aracari
- Chestnut-tailed Starling
- Chilean Flamingo
- Chilean Flicker
- Chiloe Wigeon
- Chimango Caracara
- Chorister Robin-Chat
- Cirl Bunting
- Clark's Nutcracker
- Clay-colored Thrush
- Cocoi Heron
- Common Blackbird
- Common Chaffinch
- Common Crane
- Common Cuckoo
- Common Emerald Dove
- Common Goldeneye
- Common Kestrel
- Common Linnet
- Common Myna
- Common Ostrich
- Common Pheasant
- Common Reed Warbler
- Common Shelduck
- Common Starling
- Common Tern
- Corn Bunting
- Coscoroba Swan
- Crested Barbet
- Crested Black Tyrant
- Crested Caracara
- Crested Coua
- Crested Duck
- Crested Lark
- Crested Tit
- Crowned Cormorant
- Cuban Emerald
- Curlew Sandpiper