- Campo Flicker
- Canada Goose
- Canada Jay
- Canary Islands Chaffinch
- Cape May Warbler
- Cape Sparrow
- Cape Teal
- Cape Wagtail
- Capped Heron
- Carrion Crow
- Carunculated Caracara
- Caspian Gull
- Caspian Tern
- Cedar Waxwing
- Cetti's Warbler
- Chaco Chachalaca
- Chalk-browed Mockingbird
- Chestnut-backed Sparrow-Lark
- Chestnut-bellied Sandgrouse
- Chestnut-breasted Mannikin
- Chestnut-capped Brushfinch
- Chestnut-crowned Antpitta
- Chestnut-eared Aracari
- Chestnut-sided Warbler
- Chestnut-tailed Starling
- Chinspot Batis
- Choco Toucan
- Choco Trogon
- Chopi Blackbird
- Cinereous Vulture
- Cinnamon-chested Bee-eater
- Cinnamon Becard
- Cinnamon Flycatcher
- Citril Finch
- Clark's Nutcracker
- Clay-colored Thrush
- Coal Tit
- Cocoa Woodcreeper
- Cocoi Heron
- Collared Aracari
- Collared Flycatcher
- Collared Inca
- Collared Pratincole
- Collared Trogon
- Common Black Hawk
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Firecrest
- Common Goldeneye
- Common Grasshopper Warbler
- Common Greenshank
- Common Gull
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Redpoll
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rosefinch
- Common Sandpiper
- Common Shelduck
- Common Snipe
- Common Starling
- Common Tailorbird
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Corn Bunting
- Cory's Shearwater
- Crane Hawk
- Cream-colored Courser
- Crested Caracara
- Crested Guan
- Crested Lark
- Crested Oropendola
- Crested Tit
- Crimson-backed Tanager
- Crimson-breasted Shrike
- Crimson-crested Woodpecker
- Crimson-mantled Woodpecker
- Crimson-rumped Toucanet
- Crow-billed Drongo
- Crowned Lapwing
- Crowned Woodnymph
- Crowned Woodnymph (fannyae)
- Curlew Sandpiper