- Cabot's Tern
- California Quail
- Campo Flicker
- Canada Goose
- Carib Grackle
- Caspian Tern
- Cedar Waxwing
- Chestnut-breasted Mannikin
- Chestnut-fronted Macaw
- Chilean Elaenia
- Chilean Flamingo
- Chilean Skua
- Chilean Swallow
- Chiloe Wigeon
- Chimango Caracara
- Cinereous Harrier
- Cirl Bunting
- Clay-colored Thrush
- Coal Tit
- Coconut Lorikeet
- Common Blackbird
- Common Crane
- Common Eider
- Common Emerald Dove
- Common Firecrest
- Common Gallinule
- Common Ground Dove
- Common Gull
- Common Kestrel
- Common Moorhen
- Common Myna
- Common Nightingale
- Common Pheasant
- Common Pochard
- Common Redshank
- Common Sandpiper
- Common Shelduck
- Common Starling
- Common Tern
- Common Waxbill
- Common Wood Pigeon
- Correndera Pipit
- Crested Caracara
- Crested Caracara (cheriway)
- Crested Duck
- Crested Guan
- Crested Oropendola
- Crested Serpent Eagle
- Crowned Woodnymph