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| Type | Common Name | [Latin Name] |
| Canvasback | - Canvasback | [Aythya valisineria] |
| Capercaillie | - Western Capercaillie | [Tetrao urogallus] |
| Caracara | - Crested Caracara | [Caracara cheriway] |
| Cardinal | - Northern Cardinal | [Cardinalis cardinalis] |
| 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 hudsonica] |
| 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] |
| 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 | [Phalacrocorax penicillatus] |
| Cormorant | - Double-crested Cormorant | [Phalacrocorax auritus] |
| Cormorant | - Great Cormorant | [Phalacrocorax carbo] |
| Cormorant | - Neotropic Cormorant | [Phalacrocorax brasilianus] |
| Cormorant | - Pelagic Cormorant | [Phalacrocorax pelagicus] |
| Cormorant | - Red-faced Cormorant | [Phalacrocorax urile] |
| Cowbird | - Bronzed Cowbird | [Molothrus aeneus] |
| Cowbird | - Brown-headed Cowbird | [Molothrus ater] |
| Crane | - Hooded Crane | [Grus monacha] |
| Crane | - Japanese Crane | [Grus japonensis] |
| Crane | - Sandhill Crane | [Grus canadensis] |
| 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 | - Carrion Crow | [Corvus corone corone] |
| Crow | - Fish Crow | [Corvus ossifragus] |
| Crow | - Hooded Crow | [Corvus corone cornix] |
| Crow | - Large-billed Crow | [Corvus macrorhynchos] |
| Crow | - Northwestern Crow | [Corvus caurinus] |
| Cuckoo | - Black-billed Cuckoo | [Coccyzus erythropthalmus] |
| Cuckoo | - Common Cuckoo | [Cuculus canorus] |
| Cuckoo | - Mangrove Cuckoo | [Coccyzus minor] |
| Cuckoo | - Yellow-billed Cuckoo | [Coccyzus americanus] |
| Curlew | - Eurasian Curlew | [Numenius arquata] |
| Curlew | - Long-billed Curlew | [Numenius americanus] |