| Turquoise Jay Cyanolyca turcosa | Passeriformes / Corvidae | LC |
| White-collared Jay Cyanolyca viridicyanus | Passeriformes / Corvidae | LC |
| Blue-headed Sunbird Cyanomitra alinae | Passeriformes / Nectariniidae | LC |
| Bannerman's Sunbird Cyanomitra bannermani | Passeriformes / Nectariniidae | LC |
| Blue-throated Brown Sunbird Cyanomitra cyanolaema | Passeriformes / Nectariniidae | LC |
| Olive Sunbird Cyanomitra olivacea | Passeriformes / Nectariniidae | LC |
| Cameroon Sunbird Cyanomitra oritis | Passeriformes / Nectariniidae | LC |
| Grey Sunbird Cyanomitra veroxii | Passeriformes / Nectariniidae | LC |
| Green-headed Sunbird Cyanomitra verticalis | Passeriformes / Nectariniidae | LC |
| Iberian Magpie Cyanopica cooki | Passeriformes / Corvidae | LC |
| Spix's Macaw Cyanopsitta spixii | Psittaciformes / Psittacidae | EW |
| Yellow-crowned Parakeet Cyanoramphus auriceps | Psittaciformes / Psittaculidae | NT |
| Norfolk Parakeet Cyanoramphus cookii | Psittaciformes / Psittaculidae | NE |
| Chatham Islands Parakeet Cyanoramphus forbesi | Psittaciformes / Psittaculidae | VU |
| Malherbe's Parakeet Cyanoramphus malherbi | Psittaciformes / Psittaculidae | NE |
| Red-crowned Parakeet Cyanoramphus novaezelandiae | Psittaciformes / Psittaculidae | NE |
| New Caledonian Parakeet Cyanoramphus saisseti | Psittaciformes / Psittaculidae | NE |
| Raiatea Parakeet Cyanoramphus ulietanus | Psittaciformes / Psittaculidae | EX |
| Antipodes Parakeet Cyanoramphus unicolor | Psittaciformes / Psittaculidae | VU |
| Black-fronted Parakeet Cyanoramphus zealandicus | Psittaciformes / Psittaculidae | EX |
| Rufous-browed Peppershrike Cyclarhis gujanensis | Passeriformes / Vireonidae | LC |
| Black-billed Peppershrike Cyclarhis nigrirostris | Passeriformes / Vireonidae | LC |
| Large Fig Parrot Cyclopsitta desmarestii | Psittaciformes / Psittaculidae | NE |
| Double-eyed Fig Parrot Cyclopsitta diophthalma | Psittaciformes / Psittaculidae | NE |
| Edwards's Fig Parrot Cyclopsitta edwardsii | Psittaciformes / Psittaculidae | LC |
| Salvadori's Fig Parrot Cyclopsitta salvadorii | Psittaciformes / Psittaculidae | LC |
| Trumpeter Swan Cygnus buccinator | Anseriformes / Anatidae | LC |
| Fasciated Antshrike Cymbilaimus lineatus | Passeriformes / Thamnophilidae | LC |
| Bamboo Antshrike Cymbilaimus sanctaemariae | Passeriformes / Thamnophilidae | LC |
| Black-and-red Broadbill Cymbirhynchus macrorhynchos | Passeriformes / Eurylaimidae | NE |
| Golden-crowned Emerald Cynanthus auriceps | Apodiformes / Trochilidae | LC |
| Canivet's Emerald Cynanthus canivetii | Apodiformes / Trochilidae | LC |
| Turquoise-crowned Hummingbird Cynanthus doubledayi | Apodiformes / Trochilidae | LC |
| Cozumel Emerald Cynanthus forficatus | Apodiformes / Trochilidae | LC |
| Broad-billed Hummingbird Cynanthus latirostris | Apodiformes / Trochilidae | LC |
| Tres Marias Hummingbird Cynanthus lawrencei | Apodiformes / Trochilidae | NT |
| Sunda Blue Flycatcher Cyornis caerulatus | Passeriformes / Muscicapidae | VU |
| Rufous-breasted Blue Flycatcher Cyornis camarinensis | Passeriformes / Muscicapidae | VU |
| Sula Jungle Flycatcher Cyornis colonus | Passeriformes / Muscicapidae | NT |
| Blue-breasted Blue Flycatcher Cyornis herioti | Passeriformes / Muscicapidae | NT |
| Meratus Blue Flycatcher Cyornis kadayangensis | Passeriformes / Muscicapidae | NT |
| Kalao Blue Flycatcher Cyornis kalaoensis | Passeriformes / Muscicapidae | NE |
| Palawan Blue Flycatcher Cyornis lemprieri | Passeriformes / Muscicapidae | NT |
| Dayak Blue Flycatcher Cyornis montanus | Passeriformes / Muscicapidae | LC |
| Nicobar Jungle Flycatcher Cyornis nicobaricus | Passeriformes / Muscicapidae | NT |
| Sulu Jungle Flycatcher Cyornis ocularis | Passeriformes / Muscicapidae | NE |
| Fulvous-chested Jungle Flycatcher Cyornis olivaceus | Passeriformes / Muscicapidae | LC |
| Sulawesi Blue Flycatcher Cyornis omissus | Passeriformes / Muscicapidae | NE |
| White-bellied Blue Flycatcher Cyornis pallidipes | Passeriformes / Muscicapidae | LC |
| Banggai Jungle Flycatcher Cyornis pelingensis | Passeriformes / Muscicapidae | NT |