- Cabot's Tragopan
- California Gull
- California Scrub Jay
- Cape Longclaw
- Cape Sparrow
- Cape Starling
- Cape Vulture
- Cape Wagtail
- Capuchin Babbler
- Cattle Tyrant
- Chaco Chachalaca
- Chalk-browed Mockingbird
- Channel-billed Toucan
- Chattering Lory
- Chestnut-backed Scimitar Babbler
- Chestnut-bellied Sandgrouse
- Chestnut-breasted Mannikin
- Chestnut-fronted Macaw
- Chilean Mockingbird
- Chimango Caracara
- Chinspot Batis
- Collared Imperial Pigeon
- Common Blackbird
- Common Buzzard
- Common Green Magpie
- Common Ground Dove
- Common House Martin
- Common Linnet
- Common Moorhen
- Common Myna
- Common Pheasant
- Common Starling
- Common Waxbill
- Coppersmith Barbet
- Coqui Francolin
- Costa's Hummingbird
- Crested Barbet
- Crested Caracara
- Crested Duck
- Crested Fireback
- Crested Partridge
- Crimson-breasted Shrike
- Crimson-rumped Toucanet
- Curl-crested Aracari