| Common Name | Scientific name |
|---|---|
| Slaty-breasted Tinamou | Crypturellus boucardi |
| Slaty-capped Flycatcher | Leptopogon superciliaris |
| Slaty-headed Parakeet | Psittacula himalayana |
| Slaty-tailed Trogon | Trogon massena |
| Slaty-winged Foliage-gleaner | Philydor fuscipenne |
| Slender Sheartail | Doricha enicura |
| Slender-billed Curlew | Numenius tenuirostris |
| Slender-billed Grackle | Quiscalus palustris |
| Slender-billed Gull | Chroicocephalus genei |
| Slender-billed Kite | Helicolestes hamatus |
| Smew | Mergellus albellus |
| Smith's Longspur | Calcarius pictus |
| Smoky-brown Woodpecker | Picoides fumigatus |
| Smooth-billed Ani | Crotophaga ani |
| Snail Kite | Rostrhamus sociabilis |
| Snow Bunting | Plectrophenax nivalis |
| Snow Goose | Anser caerulescens |
| Snow Goose | Chen caerulescens |
| Snowcap | Microchera albocoronata |
| Snowfinch | Montifringilla nivalis |
| Snowy Cotinga | Carpodectes nitidus |
| Snowy Egret | Egretta thula |
| Snowy Owl | Bubo scandiacus |
| Snowy Plover | Charadrius nivosus |
| Snowy-bellied Hummingbird | Amazilia edward |
RingBase adheres to EURING codes.
