- Caatinga Cacholote
- Campo Flicker
- Campo Troupial
- Cape Batis
- Cape Bulbul
- Cape Bunting
- Cape Canary
- Cape Cormorant
- Cape Crow
- Cape Gannet
- Cape Grassbird
- Cape Longclaw
- Cape Robin-Chat
- Cape Rock Thrush
- Cape Rockjumper
- Cape Shoveler
- Cape Sparrow
- Cape Spurfowl
- Cape Starling
- Cape Sugarbird
- Cape Teal
- Cape Vulture
- Cape Wagtail
- Cape Weaver
- Cape White-eye
- Capped Wheatear
- Cardinal Woodpecker
- Cattle Tyrant
- Chat Flycatcher
- Chestnut-capped Blackbird
- Chestnut-eared Aracari
- Chestnut-vented Warbler
- Chiguanco Thrush
- Chilean Flamingo
- Chinspot Batis
- Chopi Blackbird
- Chorister Robin-Chat
- Cinereous Tyrant
- Cinnamon-breasted Bunting
- Cinnamon Teal
- Clay-colored Thrush
- Cliff Flycatcher
- Cliff Parakeet
- Cobalt-rumped Parrotlet
- Cocoi Heron
- Collared Palm Thrush
- Collared Plover
- Collared Pratincole
- Collared Sunbird
- Common Buttonquail
- Common Buzzard
- Common Gallinule
- Common Greenshank
- Common Moorhen
- Common Myna
- Common Ostrich
- Common Ringed Plover
- Common Sandpiper
- Common Scimitarbill
- Common Tern
- Common Waxbill
- Coqui Francolin
- Coscoroba Swan
- Creamy-bellied Thrush
- Crescent-chested Puffbird
- Crested Barbet
- Crested Caracara
- Crested Duck
- Crested Francolin
- Crested Guineafowl
- Crested Oropendola
- Crimson-breasted Shrike
- Croaking Ground Dove
- Crowned Cormorant
- Crowned Hornbill
- Crowned Lapwing
- Cuckoo-finch
- Curlew Sandpiper