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| Type | Common Name | [Latin Name] |
| Rail | - Clapper Rail - Atlantic Coast | [Rallus crepitans crepitans] |
| Rail | - Clapper Rail - Gulf Coast | [Rallus crepitans scotti] |
| Rail | - King Rail | [Rallus elegans] |
| Rail | - Virginia Rail | [Rallus limicola] |
| Raven | - Chihuahuan Raven | [Corvus cryptoleucus] |
| Raven | - Common Raven | [Corvus corax] |
| Razorbill | - Razorbill | [Alca torda] |
| Redhead | - Redhead | [Aythya americana] |
| Redpoll | - Common Redpoll | [Acanthis flammea] |
| Redshank | - Common Redshank | [Tringa totanus] |
| Redshank | - Spotted Redshank | [Tringa erythropus] |
| Redstart | - American Redstart | [Setophaga ruticilla] |
| Redstart | - Painted Redstart | [Myioborus pictus] |
| Redstart | - Slate-throated Redstart | [Myioborus miniatus] |
| Reef-Heron | - Western Reef-Heron | [Egretta gularis] |
| Roadrunner | - Greater Roadrunner | [Geococcyx californianus] |
| Robin | - American Robin | [Turdus migratorius] |
| Robin | - European Robin | [Erithacus rubecula] |
| Robin | - Rufous-backed Robin | [Turdus rufopalliatus] |
| Rook | - Rook | [Corvus frugilegus] |
| Rosy-Finch | - Black Rosy-Finch | [Leucosticte atrata] |
| Rosy-Finch | - Brown-capped Rosy-Finch | [Leucosticte australis] |
| Rosy-Finch | - Gray-crowned Rosy-Finch - Aleutians | [Leucosticte tephrocotis griseonucha] |
| Rosy-Finch | - Gray-crowned Rosy-Finch - Hepburn's | [Leucosticte tephrocotis littoralis] |
| Rosy-Finch | - Gray-crowned Rosy-Finch - Interior | [Leucosticte tephrocotis tephrocotis?] |
| Ruff | - Ruff | [Calidris pugnax] |