- Cabot's Tern (eurygnathus)
- Campo Flicker
- Campo Miner
- Canada Goose
- Cape Barren Goose
- Cape Petrel
- Capped Heron
- Carib Grackle
- Carrion Crow
- Carunculated Caracara
- Caspian Tern
- Cattle Tyrant
- Cauca Guan
- Cerulean Warbler
- Cetti's Warbler
- Chaco Chachalaca
- Chalk-browed Mockingbird
- Channel-billed Toucan
- Channel-billed Toucan (ariel)
- Charming Hummingbird
- Checkered Woodpecker
- Chestnut-bellied Flowerpiercer
- Chestnut-bellied Sandgrouse
- Chestnut-bellied Seed Finch
- Chestnut-bellied Seedeater
- Chestnut-bellied Starling
- Chestnut-breasted Coronet
- Chestnut-capped Brushfinch
- Chestnut-colored Woodpecker
- Chestnut-crowned Antpitta
- Chestnut-eared Aracari
- Chestnut-headed Bee-eater
- Chestnut-headed Oropendola
- Chestnut-naped Antpitta
- Chestnut-sided Warbler
- Chestnut-winged Cinclodes
- Chestnut Piculet
- Chimango Caracara
- Chinstrap Penguin
- Choco Toucan
- Choco Trogon
- Chotoy Spinetail
- Chukar Partridge
- Cinereous Conebill
- Cinnamon-breasted Bunting
- Cinnamon Attila
- Cinnamon Flycatcher
- Cirl Bunting
- Citrine Wagtail
- Clay-colored Thrush
- Cliff Flycatcher
- Coal-crested Finch
- Cobalt-winged Parakeet
- Cock-tailed Tyrant
- Cocoa Woodcreeper
- Cocoi Heron
- Collared Antshrike
- Collared Aracari
- Collared Falconet
- Collared Imperial Pigeon
- Collared Inca
- Collared Kingfisher
- Collared Owlet
- Collared Pratincole
- Collared Trogon
- Collared Whitestart
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Chlorospingus (ophthalmicus)
- Common Crane
- Common Cuckoo
- Common Eider
- Common Firecrest
- Common Gallinule
- Common Greenshank
- Common Ground Dove
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Loon
- Common Merganser
- Common Moorhen
- Common Murre
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Paradise Kingfisher
- Common Pheasant
- Common Pochard
- Common Potoo
- Common Redpoll
- Common Redshank
- Common Redshank (robusta)
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rosefinch
- Common Sandpiper
- Common Scoter
- Common Shelduck
- Common Snipe
- Common Starling
- Common Swift
- Common Tern
- Common Tody-Flycatcher
- Common Whitethroat
- Common Wood Pigeon
- Coppery-headed Emerald
- Coppery Emerald
- Corn Bunting
- Crab-plover
- Cream-colored Courser
- Cream-colored Woodpecker
- Crescent-caped Lophorina
- Crescent-faced Antpitta
- Crested Ant Tanager
- Crested Bobwhite
- Crested Caracara
- Crested Caracara (cheriway)
- Crested Guan
- Crested Lark
- Crested Oropendola
- Crested Owl
- Crested Serpent Eagle
- Crested Tit
- Cricket Warbler
- Crimson-backed Tanager
- Crimson-breasted Finch
- Crimson-collared Tanager
- Crimson-crested Woodpecker
- Crimson-hooded Manakin
- Crimson-rumped Toucanet
- Croaking Ground Dove
- Crowned Sandgrouse
- Crowned Woodnymph
- Curl-crested Jay
- Curlew Sandpiper
- Cut-throat Finch