- Cabanis's Bunting
- Cabanis's Wren
- Campo Flicker
- Canada Goose
- Cape Barren Goose
- Cape Robin-Chat
- Cape Teal
- Capped Conebill
- Capped Heron
- Capped Wheatear
- Carib Grackle
- Carrion Crow
- Carunculated Caracara
- Cattle Tyrant
- Cetti's Warbler
- Chabert Vanga
- Chaco Chachalaca
- Chaco Puffbird
- Chalk-browed Mockingbird
- Changeable Hawk-Eagle
- Channel-billed Toucan
- Channel-billed Toucan (ariel)
- Chestnut-backed Antbird
- Chestnut-backed Antshrike
- Chestnut-backed Owlet
- Chestnut-bellied Euphonia
- Chestnut-bellied Mountain Tanager
- Chestnut-bellied Sandgrouse
- Chestnut-bellied Seed Finch
- Chestnut-breasted Coronet
- Chestnut-capped Babbler
- Chestnut-capped Brushfinch
- Chestnut-crowned Antpitta
- Chestnut-eared Aracari
- Chestnut-headed Bee-eater
- Chestnut-headed Oropendola
- Chestnut-vented Conebill
- Chestnut-vented Nuthatch
- Chestnut-winged Cinclodes
- Chestnut Forest Rail
- Chinese Pond Heron
- Choco Toucan
- Chopi Blackbird
- Cinereous-breasted Spinetail
- Cinereous Conebill
- Cinereous Vulture
- Cinnamon-chested Bee-eater
- Cinnamon-throated Woodcreeper
- Cinnamon Attila
- Cinnamon Becard
- Cinnamon Bittern
- Cinnamon Flycatcher
- Cinnamon Woodpecker
- Cirl Bunting
- Citrine Warbler
- Clay-colored Thrush
- Cliff Flycatcher
- Coal-crested Finch
- Cobalt-winged Parakeet
- Cock-tailed Tyrant
- Cocoi Heron
- Collared Aracari
- Collared Crescentchest
- Collared Falconet
- Collared Forest Falcon
- Collared Inca
- Collared Kingfisher
- Collared Scops Owl
- Collared Sunbird
- Collared Trogon (aurantiiventris)
- Collared Whitestart
- Comb-crested Jacana
- Common Black Hawk
- Common Blackbird
- Common Bronzewing
- Common Bush Tanager
- Common Bush Tanager (ophthalmicus)
- Common Buzzard
- Common Chaffinch
- Common Chiffchaff
- Common Cuckoo
- Common Eider
- Common Emerald Dove
- Common Flameback
- Common Goldeneye
- Common Grasshopper Warbler
- Common Greenshank
- Common Ground Dove
- Common Hawk-Cuckoo
- Common Hill Myna
- Common House Martin
- Common Iora
- Common Jery
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Merganser
- Common Moorhen
- Common Myna
- Common Newtonia
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Ringed Plover
- Common Sandpiper
- Common Shelduck
- Common Smoky Honeyeater
- Common Snipe
- Common Starling
- Common Swift
- Common Tailorbird
- Common Tern
- Common Tody-Flycatcher
- Common Whitethroat
- Common Wood Pigeon
- Common Woodshrike
- Coppersmith Barbet
- Coquerel's Coua
- Coqui Francolin
- Cotton Pygmy Goose
- Crane Hawk
- Cream-winged Cinclodes
- Creamy-crested Spinetail
- Crescent Honeyeater
- Crested Becard
- Crested Berrypecker
- Crested Bobwhite
- Crested Coua
- Crested Drongo
- Crested Finchbill
- Crested Francolin
- Crested Guan
- Crested Honey Buzzard
- Crested Oropendola
- Crested Pigeon
- Crested Serpent Eagle
- Crested Treeswift
- Crimson-backed Flameback
- Crimson-backed Tanager
- Crimson-bellied Parakeet
- Crimson-crested Woodpecker
- Crimson-fronted Barbet
- Crimson-rumped Toucanet
- Crimson Chat
- Crimson Rosella
- Crimson Sunbird
- Crossley's Vanga
- Crow-billed Drongo
- Crowned Lapwing
- Crowned Woodnymph
- Cuckoo Roller
- Curl-crested Aracari
- Curl-crested Jay