- California Condor
- California Quail
- California Scrub Jay
- Canada Goose
- Canada Jay
- Canada Warbler
- Canvasback
- Canyon Towhee
- Carolina Wren
- Caspian Tern
- Cedar Waxwing
- Chestnut-capped Warbler
- Chestnut-sided Warbler
- Chipping Sparrow
- Cinnamon Hummingbird
- Cinnamon Teal
- Clark's Nutcracker
- Clay-colored Thrush
- Cocoa Woodcreeper
- Collared Aracari
- Collared Whitestart
- Common Black Hawk
- Common Eider
- Common Goldeneye
- Common Grackle
- Common Ground Dove
- Common Loon
- Common Merganser
- Common Moorhen
- Common Nighthawk
- Common Snipe
- Common Starling
- Common Tern
- Common Yellowthroat
- Cooper's Hawk
- Costa's Hummingbird
- Couch's Kingbird
- Crested Caracara
- Crested Guan
- Curve-billed Thrasher