| Common Name | Scientific name |
|---|---|
| Cory's Shearwater | Calonectris borealis |
| Cory's Shearwater | Calonectris diomedea |
| Coscoroba Swan | Coscoroba coscoroba |
| Costa Rican Brushfinch | Arremon costaricensis |
| Costa Rican Pygmy-Owl | Glaucidium costaricanum |
| Costa Rican Swift | Chaetura fumosa |
| Costa Rican Warbler | Basileuterus melanotis |
| Costa's Hummingbird | Calypte costae |
| Cotton Pygmy Goose | Nettapus coromandelianus |
| Couch's Kingbird | Tyrannus couchii |
| Cozumel Emerald | Chlorostilbon forficatus |
| Cozumel Thrasher | Toxostoma guttatum |
| Cozumel Vireo | Vireo bairdi |
| Crab-plover | Dromas ardeola |
| Crane Hawk | Geranospiza caerulescens |
| Craveri's Murrelet | Synthliboramphus craveri |
| Cream-colored Courser | Cursorius cursor |
| Crescent-chested Warbler | Oreothlypis superciliosa |
| Crested Auklet | Aethia cristatella |
| Crested Bobwhite | Colinus cristatus |
| Crested Caracara | Caracara cheriway |
| Crested Eagle | Morphnus guianensis |
| Crested Fireback | Lophura ignita |
| Crested Guan | Penelope purpurascens |
| Crested Lark | Galerida cristata |
RingBase adheres to EURING codes.
