- Cape Bunting
- Cape Longclaw
- Cape Rock Thrush
- Cape Sugarbird
- Cape Teal
- Cape Wagtail
- Cape Weaver
- Capped Wheatear
- Cardinal Woodpecker
- Carib Grackle
- Carrion Crow
- Caspian Gull
- Cetti's Warbler
- Chestnut-hooded Laughingthrush
- Chestnut Weaver
- Chiguanco Thrush
- Chubb's Cisticola
- Cinereous Conebill
- Cinnamon-chested Bee-eater
- Cinnamon Teal
- Common Blackbird
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Gallinule
- Common Grasshopper Warbler
- Common Gull
- Common Kestrel
- Common Moorhen
- Common Nightingale
- Common Ostrich
- Common Pochard
- Common Quail
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Sandpiper
- Common Scimitarbill
- Common Starling
- Common Tern
- Common Whitethroat
- Corn Bunting
- Costa Rican Pygmy Owl
- Crested Barbet
- Crested Caracara (cheriway)
- Crested Francolin
- Crested Lark
- Crimson-headed Partridge
- Croaking Ground Dove
- Crowned Hornbill
- Crowned Lapwing