| Common Name | Scientific name |
|---|---|
| Scaly-throated Leaftosser | Sclerurus guatemalensis |
| Scaly-throated Foliage-gleaner | Anabacerthia variegaticeps |
| Scaly-naped Pigeon | Patagioenas squamosa |
| Scaly-breasted Wren | Microcerculus marginatus |
| Scaly-breasted Thrasher | Allenia fusca |
| Scaly-breasted Munia | Lonchura punctulata |
| Scaly-breasted Hummingbird | Phaeochroa cuvierii |
| Scaled Quail | Callipepla squamata |
| Scaled Pigeon | Patagioenas speciosa |
| Scaled Antpitta | Grallaria guatimalensis |
| Scale-crested Pygmy-Tyrant | Lophotriccus pileatus |
| Say's Phoebe | Sayornis saya |
| Savi's Warbler | Locustella luscinioides |
| Savannah Sparrow | Passerculus sandwichensis |
| Savanna Hawk | Buteogallus meridionalis |
| Sardinian Warbler | Sylvia melanocephala |
| Sapphire-throated Hummingbird | Lepidopyga coeruleogularis |
| Sapium | Sapium stylare |
| Sapayoa | Sapayoa aenigma |
| Sapan | Clathrotropis brunnea |
| Sandwich Tern | Sterna sandvicensis |
| Sandwich Tern | Thalasseus sandvicensis |
| Sandhill Crane | Antigone canadensis |
| Sandhill Crane | Grus canadensis |
| Sanderling | Calidris alba |
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