| Common Name | Scientific name |
|---|---|
| Blue-winged Goose | Cyanochen cyanoptera |
| Blue Jay | Cyanocitta cristata |
| Steller's Jay | Cyanocitta stelleri |
| Blue-black Grosbeak | Cyanocompsa cyanoides |
| Blue Bunting | Cyanocompsa parellina |
| Black-chested Jay | Cyanocorax affinis |
| Purplish-backed Jay | Cyanocorax beecheii |
| Tufted Jay | Cyanocorax dickeyi |
| Bushy-crested Jay | Cyanocorax melanocyaneus |
| San Blas Jay | Cyanocorax sanblasianus |
| Green Jay | Cyanocorax yncas |
| Yucatan Jay | Cyanocorax yucatanicus |
| Zapata Rail | Cyanolimnas cerverai |
| Silvery-throated Jay | Cyanolyca argentigula |
| Azure-hooded Jay | Cyanolyca cucullata |
| White-throated Jay | Cyanolyca mirabilis |
| Dwarf Jay | Cyanolyca nana |
| Black-throated Jay | Cyanolyca pumilo |
| Blue-headed Hummingbird | Cyanophaia bicolor |
| Iberian Magpie | Cyanopica cooki |
| Red-crowned Parakeet | Cyanoramphus novaezelandiae |
| Rufous-browed Peppershrike | Cyclarhis gujanensis |
| Black Swan | Cygnus atratus |
| Bewick's Swan | Cygnus bewickii |
| Trumpeter Swan | Cygnus buccinator |
RingBase adheres to EURING codes.
