- Cassin's finch
Carpodacus cassinii
- house finch
Carpodacus mexicanus
- lesser yellow-headed vulture
Cathartes burrovianus
- hermit thrush
Catharus guttatus
- greater sage grouse
Centrocercus urophasianus
- greater sage grouse
Centrocercus urophasianus
- killdeer
Charadrius vociferus
- green honeycreeper
Chlorophanes spiza
- northern harrier
Circus cyaneus
- marsh wren
Cistothorus palustris
- northern flicker
Colaptes auratus
- American crow
Corvus brachyrhynchos
- Ceratomia catalpae
- Cotesia congregata