- Calandra Lark
- California Gull
- Canada Goose
- Cape Batis
- Cape Bulbul
- Cape Bunting
- Cape Canary
- Cape Cormorant
- Cape Crow
- Cape Eagle-Owl
- Cape Robin-Chat
- Cape Rockjumper
- Cape Shoveler
- Cape Siskin
- Cape Sparrow
- Cape Spurfowl
- Cape Starling
- Cape Sugarbird
- Cape Teal
- Cape Wagtail
- Cape Weaver
- Cape White-eye
- Capped Heron
- Capped Wheatear
- Cardinal Quelea
- Cardinal Woodpecker
- Carib Grackle
- Carrion Crow
- Caspian Gull
- Caspian Plover
- Caspian Tern
- Cassin's Finch
- Cattle Tyrant
- Chat Flycatcher
- Chestnut-backed Sparrow-Lark
- Chestnut-banded Plover
- Chestnut-bellied Rock Thrush
- Chestnut-bellied Sandgrouse
- Chestnut-breasted Coronet
- Chestnut-breasted Malkoha
- Chestnut-crowned Antpitta
- Chestnut-fronted Macaw
- Chestnut-headed Bee-eater
- Chestnut-naped Spurfowl
- Chestnut-tailed Starling
- Chestnut-winged Cuckoo
- Chestnut Munia
- Chestnut Sparrow
- Chestnut Thrush
- Chestnut Weaver
- Chiguanco Thrush
- Chilean Flamingo
- Chinese Pond Heron
- Chinspot Batis
- Chukar Partridge
- Cinereous Conebill
- Cinereous Vulture
- Cinnamon-breasted Bunting
- Cinnamon-chested Bee-eater
- Cinnamon Flycatcher
- Cinnamon Teal
- Cirl Bunting
- Citrine Wagtail
- Cliff Flycatcher
- Cloud-forest Pygmy Owl
- Coal Tit
- Cocoi Heron
- Collared Falconet
- Collared Inca
- Collared Kingfisher
- Collared Palm Thrush
- Collared Pratincole
- Collared Sunbird
- Common Blackbird
- Common Bulbul
- Common Buzzard
- Common Cactus Finch
- Common Chiffchaff
- Common Crane
- Common Cuckoo
- Common Eider
- Common Emerald Dove
- Common Flameback
- Common Gallinule
- Common Goldeneye
- Common Grasshopper Warbler
- Common Green Magpie
- Common Greenshank
- Common Hill Myna
- Common Kestrel
- Common Kingfisher
- Common Linnet
- Common Miner
- Common Moorhen
- Common Murre
- Common Myna
- Common Ostrich
- Common Pheasant
- Common Pochard
- Common Potoo
- Common Redshank
- Common Redstart
- Common Reed Bunting
- Common Reed Warbler
- Common Ringed Plover
- Common Rock Thrush
- Common Rosefinch
- Common Sandpiper
- Common Scimitarbill
- Common Shelduck
- Common Snipe
- Common Starling
- Common Tern
- Common Tody-Flycatcher
- Common Waxbill
- Common Whitethroat
- Common Wood Pigeon
- Coppery-tailed Coucal
- Coqui Francolin
- Cordilleran Canastero
- Corn Bunting
- Cotton Pygmy Goose
- Crab-plover
- Crane Hawk
- Cream-winged Cinclodes
- Crested Barbet
- Crested Bobwhite
- Crested Caracara (cheriway)
- Crested Duck
- Crested Finchbill
- Crested Francolin
- Crested Goshawk
- Crested Honey Buzzard
- Crested Lark
- Crested Myna
- Crested Oropendola
- Crested Serpent Eagle
- Crested Tit
- Crimson-breasted Shrike
- Crimson-crested Woodpecker
- Crimson-rumped Toucanet
- Crimson-rumped Waxbill
- Crimson-winged Woodpecker
- Croaking Ground Dove
- Crowned Cormorant
- Crowned Eagle
- Crowned Hornbill
- Crowned Lapwing
- Crowned Woodnymph
- Curlew Sandpiper
- Cut-throat Finch