| Common Name | Scientific name |
|---|---|
| Russet-crowned Motmot | Momotus mexicanus |
| Russet-crowned Quail-Dove | Zentrygon goldmani |
| Russet-naped Wood-Rail | Aramides albiventris |
| Russet-winged Schiffornis | Schiffornis stenorhyncha |
| Rustic Bunting | Emberiza rustica |
| Rusty Blackbird | Euphagus carolinus |
| Rusty Laughingthrush | Garrulax poecilorhynchus |
| Rusty Sparrow | Aimophila rufescens |
| Rusty-crowned Ground-Sparrow | Melozone kieneri |
| Rusty-margined Flycatcher | Myiozetetes cayanensis |
| Rüppell's Vulture | Gyps rueppelli |
| Sabine's Gull | Xema sabini |
| Sad Flycatcher | Myiarchus barbirostris |
| Saddle-billed Stork | Ephippiorhynchus senegalensis |
| Saffron Finch | Sicalis flaveola |
| Saffron-headed Parrot | Pyrilia pyrilia |
| Sage Thrasher | Oreoscoptes montanus |
| Sagebrush Sparrow | Artemisiospiza nevadensis |
| Saker Falcon | Falco cherrug |
| Saltmarsh Sparrow | Ammodramus caudacutus |
| Salvin's Albatross | Thalassarche salvini |
| Saman | Samanea saman |
| San Andres Vireo | Vireo caribaeus |
| San Blas Jay | Cyanocorax sanblasianus |
| Sand Martin | Riparia riparia |
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