- Caatinga Puffbird
- Campo Troupial
- Canada Goose
- Canary Islands Stonechat
- Cape Petrel
- Cape Vulture
- Cardinal Lory
- Carmelite Sunbird
- Cerulean Kingfisher
- Chabert Vanga
- Chaco Puffbird
- Changeable Hawk-Eagle
- Chattering Kingfisher
- Chattering Lory
- Chestnut-backed Buttonquail
- Chestnut-backed Owlet
- Chestnut-backed Thrush
- Chestnut-bellied Thrush
- Chestnut-capped Puffbird
- Chestnut-capped Thrush
- Chestnut-crowned Antpitta
- Chestnut-crowned Bush Warbler
- Chestnut-headed Bee-eater
- Chestnut-naped Francolin
- Chestnut-quilled Rock Pigeon
- Chiguanco Thrush
- Chilean Tinamou
- Chinese Barbet
- Chinese Beautiful Rosefinch
- Chinese Sparrowhawk
- Chinese Thrush
- Chocolate-backed Kingfisher
- Chocolate-vented Tyrant
- Christmas Boobook
- Cinnamon-banded Kingfisher
- Cinnamon-chested Bee-eater
- Citrine Lorikeet
- Clamorous Reed Warbler
- Clapperton's Francolin
- Clay-colored Thrush
- Cobalt-winged Parakeet
- Cochabamba Mountain Finch
- Cocoa Thrush
- Coconut Lorikeet
- Collared Forest Falcon
- Collared Kingfisher
- Collared Lory
- Collared Myna
- Collared Nightjar
- Common Babbler
- Common Buttonquail
- Common Cicadabird
- Common Diving Petrel
- Common Emerald Dove
- Common Firecrest
- Common Kestrel
- Common Kingfisher
- Common Paradise Kingfisher
- Common Redpoll
- Common Sunbird-Asity
- Comoros Thrush
- Congo Serpent Eagle
- Copper-tailed Starling
- Copper-throated Sunbird
- Copper Seedeater
- Copper Sunbird
- Coppersmith Barbet
- Coquerel's Coua
- Coral-billed Scimitar Babbler
- Corsican Nuthatch
- Crescent-chested Puffbird
- Crested Barbet
- Crested Coua
- Crested Eagle
- Crested Honey Buzzard
- Crested Kingfisher
- Crested Satinbird
- Crested Serpent Eagle
- Crimson-backed Flameback
- Crimson-backed Sunbird
- Crimson-collared Grosbeak
- Crimson-fronted Barbet
- Crimson Sunbird
- Crossley's Ground Thrush
- Cuban Macaw
- Cuckoo Roller