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| Type | Common Name | [Latin Name] |
| Cacique | - Scarlet-rumped Cacique | [Cacicus uropygialis] |
| Canvasback | - Canvasback | [Aythya valisineria] |
| Capercaillie | - Western Capercaillie | [Tetrao urogallus] |
| Caracara | - Crested Caracara | [Caracara plancus] |
| Caracara | - Yellow-headed Caracara | [Milvago chimachima] |
| Cardinal | - Northern Cardinal | [Cardinalis cardinalis] |
| Cassowary | - Southern Cassowary | [Casuarius casuarius] |
| Catbird | - Gray Catbird | [Dumetella carolinensis] |
| Chachalaca | - Plain Chachalaca | [Ortalis vetula] |
| Chaffinch | - Chaffinch | [Fringilla coelebs] |
| Chat | - Yellow-breasted Chat - Eastern | [Icteria virens virens] |
| Chat | - Yellow-breasted Chat - Western | [Icteria virens auricollis] |
| Chickadee | - Black-capped Chickadee | [Poecile atricapillus] |
| Chickadee | - Boreal Chickadee | [Poecile hudsoniccus] |
| Chickadee | - Carolina Chickadee | [Poecile carolinensis] |
| Chickadee | - Chestnut-backed Chickadee | [Poecile rufescens] |
| Chickadee | - Mexican Chickadee | [Poecile sclateri] |
| Chickadee | - Mountain Chickadee - Pacific | [Poecile gambeli baileyae] |
| Chickadee | - Mountain Chickadee - Rockies | [Poecile gambeli gambeli] |
| Chicken | - Greater Prairie-Chicken - Attwater's | [Tympanuchus cupido attwateri] |
| Chicken | - Greater Prairie-Chicken - Northern | [Tympanuchus cupido cupido] |
| Chicken | - Lesser Prairie-Chicken | [Tympanuchus pallidicinctus] |
| Chiffchaff | - Common Chiffchaff | [Phylloscopus collybita] |
| Chough | - Red-billed Chough | [Pyrrhocorax pyrrhocorax] |
| Chuck-will's-widow | - Chuck-will's-widow | [Antrostomus carolinensis] |
| Chukar | - Chukar | [Alectoris chukar] |
| Collared-Dove | - Eurasian Collared-Dove | [Streptopelia decaocto] |
| Condor | - California Condor | [Gymnogyps californianus] |
| Coot | - American Coot | [Fulica americana] |
| Coot | - Eurasian Coot | [Fulica atra] |
| Cormorant | - Brandt's Cormorant | [Urile penicillatus] |
| Cormorant | - Double-crested Cormorant | [Nannopterum auritus] |
| Cormorant | - Great Cormorant | [Phalacrocorax carbo] |
| Cormorant | - Neotropic Cormorant | [Nannopterum brasilianus] |
| Cormorant | - Pelagic Cormorant | [Urile pelagicus] |
| Cormorant | - Red-faced Cormorant | [Urile urile] |
| Coucal | - Lesser Coucal | [Centropus bengalensis] |
| Cowbird | - Bronzed Cowbird | [Molothrus aeneus] |
| Cowbird | - Brown-headed Cowbird | [Molothrus ater] |
| Crane | - Crowned Crane | [Balearica regulorum] |
| Crane | - Hooded Crane | [Grus monacha] |
| Crane | - Japanese Crane | [Grus japonensis] |
| Crane | - Sandhill Crane | [Antigone canadensis] |
| Crane | - Stanley Crane | [Anthropoides paradisea] |
| Crane | - White-naped Crane | [Grus vipio] |
| Crane | - Whooping Crane | [Grus americana] |
| Creeper | - Brown Creeper | [Certhia americana] |
| Crossbill | - Red Crossbill | [Loxia curvirostra] |
| Crossbill | - White-winged Crossbill | [Loxia leucoptera] |
| Crow | - American Crow | [Corvus brachyrhynchos] |
| Crow | - American (Northwestern) Crow | [Corvus caurinus] |
| Crow | - Carrion Crow | [Corvus corone corone] |
| Crow | - Fish Crow | [Corvus ossifragus] |
| Crow | - Hooded Crow | [Corvus corone cornix] |
| Crow | - Large-billed Crow | [Corvus macrorhynchos] |
| Crow | - Tamaulipas Crow | [Corvus imparatus] |
| Cuckoo | - Black-billed Cuckoo | [Coccyzus erythropthalmus] |
| Cuckoo | - Common Cuckoo | [Cuculus canorus] |
| Cuckoo | - Mangrove Cuckoo | [Coccyzus minor] |
| Cuckoo | - Oriental Cuckoo | [Cuculus optatus] |
| Cuckoo | - Squirrel Cuckoo | [Piaya cayana] |
| Cuckoo | - Yellow-billed Cuckoo | [Coccyzus americanus] |
| Cuckoo-Shrike | - Black-winged Cuckoo-Shrike | [Coracina melaschistos] |
| Curlew | - Eurasian Curlew | [Numenius arquata] |
| Curlew | - Far Eastern Curlew | [Numenius madagascariensis] |
| Curlew | - Long-billed Curlew | [Numenius americanus] |