| Common Name | Scientific name |
|---|---|
| Aztec Thrush | Ridgwayia pinicola |
| Sand Martin | Riparia riparia |
| Red-legged Kittiwake | Rissa brevirostris |
| Black-legged Kittiwake | Rissa tridactyla |
| Snail Kite | Rostrhamus sociabilis |
| Roadside Hawk | Rupornis magnirostris |
| Black Skimmer | Rynchops niger |
| Rock Wren | Salpinctes obsoletus |
| Lesser Antillean Saltator | Saltator albicollis |
| Black-headed Saltator | Saltator atriceps |
| Grayish Saltator | Saltator coerulescens |
| Slate-colored Grosbeak | Saltator grossus |
| Buff-throated Saltator | Saltator maximus |
| Streaked Saltator | Saltator striatipectus |
| Saman | Samanea saman |
| Sapayoa | Sapayoa aenigma |
| Sapium | Sapium stylare |
| Mediacara comun | Sapotaceae spp. |
| King Vulture | Sarcoramphus papa |
| Comb Duck | Sarkidiornis melanotos |
| Siberian Stonechat | Saxicola maurus |
| Caspian Stonechat | Saxicola maurus variegatus |
| Whinchat | Saxicola rubetra |
| European Stonechat | Saxicola rubicola |
| Stejneger's Stonechat | Saxicola stejnegeri |
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