- Calandra Lark
- Canada Goose
- Canada Warbler
- Cape Bulbul
- Cape Bunting
- Cape Canary
- Cape Cormorant
- Cape Crow
- Cape Longclaw
- Cape Robin-Chat
- Cape Shoveler
- Cape Sparrow
- Cape Spurfowl
- Cape Starling
- Cape Sugarbird
- Cape Teal
- Cape Vulture
- Cape Wagtail
- Cape Weaver
- Cape White-eye
- Capped Heron
- Capped Wheatear
- Cardinal Woodpecker
- Carib Grackle
- Carrion Crow
- Carruthers's Cisticola
- Carunculated Caracara
- Caspian Tern
- Cassin's Finch
- Cattle Tyrant
- Cauca Guan
- Cetti's Warbler
- Chabert Vanga
- Chaco Chachalaca
- Chalk-browed Mockingbird
- Changeable Hawk-Eagle
- Channel-billed Toucan
- Chat Flycatcher
- Chestnut-backed Antbird
- Chestnut-backed Sparrow-Lark
- Chestnut-bellied Sandgrouse
- Chestnut-bellied Seedeater
- Chestnut-breasted Coronet
- Chestnut-capped Brushfinch
- Chestnut-capped Warbler
- Chestnut-crowned Antpitta
- Chestnut-eared Aracari
- Chestnut-fronted Helmetshrike
- Chestnut-headed Bee-eater
- Chestnut-headed Sparrow-Lark
- Chestnut-sided Warbler
- Chestnut-tailed Starling
- Chestnut-winged Cinclodes
- Chestnut Teal
- Chestnut Weaver
- Chinese Blue Flycatcher
- Chinese Pond Heron
- Chinspot Batis
- Chipping Sparrow
- Chivi Vireo
- Choco Toucan
- Chopi Blackbird
- Cinnamon-chested Bee-eater
- Cinnamon-throated Woodcreeper
- Cinnamon Attila
- Cinnamon Becard
- Cinnamon Flycatcher
- Cinnamon Hummingbird
- Cinnamon Teal
- Cinnamon Woodpecker
- Cirl Bunting
- Clamorous Reed Warbler
- Clark's Nutcracker
- Clay-colored Thrush
- Club-winged Manakin
- Cobalt-winged Parakeet
- Cocoa Woodcreeper
- Cocoi Heron
- Collared Aracari
- Collared Inca
- Collared Palm Thrush
- Collared Pratincole
- Collared Scops Owl
- Collared Sunbird
- Collared Trogon
- Collared Whitestart
- Colombian Chachalaca
- Common Black Hawk
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Chiffchaff
- Common Chlorospingus
- Common Chlorospingus (ophthalmicus)
- Common Emerald Dove
- Common Firecrest
- Common Green Magpie
- Common Greenshank
- Common Ground Dove
- Common Gull
- Common Iora
- Common Jery
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Moorhen
- Common Myna
- Common Nightingale
- Common Ostrich
- Common Pheasant
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rock Thrush
- Common Sandpiper
- Common Scimitarbill
- Common Shelduck
- Common Snipe
- Common Starling
- Common Tailorbird
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Copper Sunbird
- Coppersmith Barbet
- Coppery-headed Emerald
- Coppery-tailed Coucal
- Coquerel's Coua
- Coqui Francolin
- Corn Bunting
- Cotton Pygmy Goose
- Crab-plover
- Crane Hawk
- Cream-colored Courser
- Crescent-faced Antpitta
- Crested Ant Tanager
- Crested Barbet
- Crested Caracara
- Crested Caracara (cheriway)
- Crested Drongo
- Crested Francolin
- Crested Guan
- Crested Lark
- Crested Oropendola
- Crested Owl
- Crested Serpent Eagle
- Crested Tit
- Crested Treeswift
- Crimson-backed Tanager
- Crimson-breasted Shrike
- Crimson-collared Tanager
- Crimson-crested Woodpecker
- Crimson-fronted Barbet
- Crimson-mantled Woodpecker
- Crimson-rumped Toucanet
- Crimson-rumped Waxbill
- Crimson Sunbird
- Croaking Cisticola
- Crowned Cormorant
- Crowned Hornbill
- Crowned Lapwing
- Crowned Slaty Flycatcher
- Crowned Woodnymph
- Cryptic Warbler
- Cuckoo-roller
- Curlew Sandpiper
- Cut-throat Finch