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| Type | Common Name | [Latin Name] |
| Sage-Grouse | - Greater Sage-Grouse | [Centrocercus urophasianus] |
| Saltator | - Buff-throated Saltator | [Saltator maximus] |
| Sanderling | - Sanderling | [Calidris alba] |
| Sandpiper | - Baird's Sandpiper | [Calidris bairdii] |
| Sandpiper | - Broad-billed Sandpiper | [Calidris falcinellus] |
| Sandpiper | - Buff-breasted Sandpiper | [Calidris subruficollis] |
| Sandpiper | - Common Sandpiper | [Actitis hypoleucos] |
| Sandpiper | - Curlew Sandpiper | [Calidris ferruginea] |
| Sandpiper | - Least Sandpiper | [Calidris minutilla] |
| Sandpiper | - Marsh Sandpiper | [Tringa stagnatilis] |
| Sandpiper | - Pectoral Sandpiper | [Calidris melanotos] |
| Sandpiper | - Purple Sandpiper | [Calidris maritima] |
| Sandpiper | - Rock Sandpiper - Alaska Mainland | [Calidris ptilocnemis tschuktsorum] |
| Sandpiper | - Rock Sandpiper - Aleutians | [Calidris ptilocnemis couesi] |
| Sandpiper | - Rock Sandpiper - Pribilofs | [Calidris ptilocnemis ptilocnemus] |
| Sandpiper | - Semipalmated Sandpiper | [Calidris pusilla] |
| Sandpiper | - Sharp-tailed Sandpiper | [Calidris acuminata] |
| Sandpiper | - Solitary Sandpiper | [Tringa solitaria] |
| Sandpiper | - Spoon-billed Sandpiper | [Calidris pygmeus] |
| Sandpiper | - Spotted Sandpiper | [Actitis macularius] |
| Sandpiper | - Stilt Sandpiper | [Calidris himantopus] |
| Sandpiper | - Terek Sandpiper | [Xenus cinereus] |
| Sandpiper | - Upland Sandpiper | [Bartramia longicauda] |
| Sandpiper | - Western Sandpiper | [Calidris mauri] |
| Sandpiper | - White-rumped Sandpiper | [Calidris fuscicollis] |
| Sandpiper | - Wood Sandpiper | [Tringa glareola] |
| Sand-Plover | - Siberian (Lesser) Sand-Plover | [Anarhynchus mongolus] |
| Sapsucker | - Red-breasted Sapsucker | [Sphyrapicus ruber] |
| Sapsucker | - Red-naped Sapsucker | [Sphyrapicus nuchalis] |
| Sapsucker | - Williamson's Sapsucker | [Sphyrapicus thyroideus] |
| Sapsucker | - Yellow-bellied Sapsucker | [Sphyrapicus varius] |
| Scaup | - Greater Scaup | [Aythya marila] |
| Scaup | - Lesser Scaup | [Aythya affinis] |
| Scoter | - Black Scoter | [Melanitta americana] |
| Scoter | - Surf Scoter | [Melanitta perspicillata] |
| Scoter | - White-winged Scoter | [Melanitta deglandi] |
| Screech-Owl | - Eastern Screech-Owl - Eastern | [Megascops asio asio] |
| Screech-Owl | - Eastern Screech-Owl - Mexican | [Megascops asio mccallii] |
| Screech-Owl | - Eastern Screech-Owl - South Central | [Megascops asio hasbroucki] |
| Screech-Owl | - Western Screech-Owl | [Megascops kennicottii] |
| Screech-Owl | - Whiskered Screech-Owl | [Megascops trichopsis] |
| Scrub-Jay | - California Scrub-Jay | [Aphelocoma californica] |
| Scrub-Jay | - Florida Scrub-Jay | [Aphelocoma coerulescens] |
| Scrub-Jay | - Woodhouse's Scrub-Jay - Central Texas | [Aphelocoma woodhouseii texana] |
| Scrub-Jay | - Woodhouse's Scrub-Jay - Great Basin | [Aphelocoma woodhouseii nevadae] |
| Scrub-Jay | - Woodhouse's Scrub-Jay - Southwestern | [Aphelocoma woodhouseii woodhouseii] |
| Sea-Eagle | - Steller's Sea-Eagle | [Haliaetus pelagicus] |
| Seedeater | - Morelet's (White-collared) Seedeater | [Sporophila moreletti] |
| Seedeater | - Ruddy-breasted Seedeater | [Sporophila minuta] |
| Seedeater | - Variable Seedeater | [Sporophila americana] |
| Seedeater | - Yellow-bellied Seedeater | [Sporophila nigricollis] |
| Seed-Finch | - Thick-billed Seed-Finch | [Oryzoborus funereus] |
| Shearwater | - Cory's Shearwater | [Calonectris borealis] |
| Shearwater | - Great Shearwater | [Ardenna gravis] |
| Shearwater | - Manx Shearwater | [Puffinus puffinus] |
| Shearwater | - Sargasso (Audubon's) Shearwater | [Puffinus lherminieri] |
| Shearwater | - Short-tailed Shearwater | [Ardenna tenuirostris] |
| Shearwater | - Sooty Shearwater | [Ardenna grisea] |
| Shearwater | - Wedge-tailed Shearwater | [Ardenna pacifica] |
| Shelduck | - Common Shelduck | [Tadorna tadorna] |
| Shelduck | - Ruddy Shelduck | [Tadorna ferruginea] |
| Shoveler | - Northern Shoveler | [Spatula clypeata] |
| Shrike | - Brown Shrike | [Lanius cristatus] |
| Shrike | - Bull-headed Shrike | [Lanius bucephalus] |
| Shrike | - Loggerhead Shrike | [Lanius ludovicianus] |
| Shrike | - Long-tailed Shrike | [Lanius schach] |
| Shrike | - Northern Shrike | [Lanius borealis] |
| Shrike | - Red-backed Shrike | [Lanius collurio] |
| Sicklebill | - White-tipped Sicklebill | [Eutoxeres aquila] |
| Siskin | - European Siskin | [Carduelis spinus] |
| Siskin | - Pine Siskin | [Spinus pinus] |
| Skimmer | - Black Skimmer | [Rynchops niger] |
| Skua | - Great Skua | [Stercorarius skua] |
| Skylark | - Eurasian Skylark | [Alauda arvensis] |
| Skylark | - Oriental Skylark | [Alauda gulgula] |
| Smew | - Smew | [Mergellus albellus] |
| Snipe | - Common Snipe | [Gallinago gallinago] |
| Snipe | - Swinhoe's Snipe | [Gallinago megala] |
| Snipe | - Wilson's Snipe | [Gallinago delicata] |
| Snowcap | - Snowcap | [Microchera albocoronata] |
| Solitaire | - Townsend's Solitaire | [Myadestes townsendi] |
| Sora | - Sora | [Porzana carolina] |
| Sparrowhawk | - Japanese Sparrowhawk | [Accipiter gularis] |
| Sparrow | - American Tree Sparrow | [Spizelloides arborea] |
| Sparrow | - Bachman's Sparrow - Eastern | [Peucaea aestivalis aestivalis] |
| Sparrow | - Baird's Sparrow | [Centronyx bairdii] |
| Sparrow | - Bell's Sparrow | [Artemisiospiza belli] |
| Sparrow | - Black-chinned Sparrow | [Spizella atrogularis] |
| Sparrow | - Black-throated Sparrow | [Amphispiza bilineata] |
| Sparrow | - Botteri's Sparrow - Arizona | [Peucaea botterii arizonae] |
| Sparrow | - Botteri's Sparrow - Texas | [Peucaea botterii texana] |
| Sparrow | - Brewer's Sparrow | [Spizella breweri] |
| Sparrow | - Cassin's Sparrow | [Peucaea cassinii] |
| Sparrow | - Chipping Sparrow | [Spizella passerina] |
| Sparrow | - Clay-colored Sparrow | [Spizella pallida] |
| Sparrow | - Eurasian Tree Sparrow | [Passer montanus] |
| Sparrow | - Field Sparrow | [Spizella pusilla] |
| Sparrow | - Fox Sparrow - Red | [Passerella iliaca iliaca] |
| Sparrow | - Fox Sparrow - Sooty | [Passerella iliaca unalaschcensis] |
| Sparrow | - Fox Sparrow - Thick-billed | [Passerella iliaca stephensi] |
| Sparrow | - Golden-crowned Sparrow | [Zonotrichia atricapilla] |
| Sparrow | - Grasshopper Sparrow - Eastern | [Ammodramus savannarum pratensis] |
| Sparrow | - Grasshopper Sparrow - Western | [Ammodramus savannarum perpallidus] |
| Sparrow | - Harris's Sparrow | [Zonotrichia querula] |
| Sparrow | - Henslow's Sparrow | [Centronyx henslowii] |
| Sparrow | - House Sparrow | [Passer domesticus] |
| Sparrow | - Lark Sparrow | [Chondestes grammacus] |
| Sparrow | - LeConte's Sparrow | [Centronyx leconteii] |
| Sparrow | - Lincoln's Sparrow | [Melospiza lincolnii] |
| Sparrow | - Nelson's Sparrow | [Centronyx nelsoni] |
| Sparrow | - Olive Sparrow | [Arremonops rufivirgatus] |
| Sparrow | - Rufous-collared Sparrow | [Zonotrichia capensis] |
| Sparrow | - Rufous-crowned Sparrow - Eastern | [Aimophila ruficeps eremoeca] |
| Sparrow | - Rufous-winged Sparrow | [Peucaea carpalis] |
| Sparrow | - Saltmarsh Sparrow | [Centronyx caudacutus] |
| Sparrow | - Ipswich Sparrow | [Passerculus sandwichensis princeps] |
| Sparrow | - Savannah Sparrow | [Passerculus sandwichensis] |
| Sparrow | - Seaside Sparrow - Eastern | [Centronyx maritimus maritimus] |
| Sparrow | - Seaside Sparrow - Gulf Coast | [Centronyx maritimus fisheri] |
| Sparrow | - Song Sparrow - Aleutian | [Melospiza melodia maxima] |
| Sparrow | - Song Sparrow - Eastern | [Melospiza melodia melodia] |
| Sparrow | - Swamp Sparrow | [Melospiza georgiana] |
| Sparrow | - Vesper Sparrow | [Pooecetes gramineus] |
| Sparrow | - White-crowned Sparrow - Eastern | [Zonotrichia leucophrys leucophrys] |
| Sparrow | - White-crowned Sparrow - Pacific | [Zonotrichia leucophrys nuttalli] |
| Sparrow | - White-crowned Sparrow - Rockies | [Zonotrichia leucophrys oriantha] |
| Sparrow | - White-crowned Sparrow - Western | [Zonotrichia leucophrys gambelii] |
| Sparrow | - White-throated Sparrow | [Zonotrichia albicollis] |
| Spoonbill | - Black-faced Spoonbill | [Platalea minor] |
| Spoonbill | - Roseate Spoonbill | [Platalea ajaja] |
| Starling | - European Starling | [Sturnus vulgaris] |
| Starling | - White-cheeked Starling | [Sturnus cineraceus] |
| Starthroat | - Long-billed Starthroat | [Heliomaster longirostris] |
| Stilt | - Black-necked Stilt - Hawaiian | [Himantopus mexicanus knudseni] |
| Stilt | - Black-necked Stilt - North American | [Himantopus mexicanus mexicanus] |
| Stilt | - Black-winged Stilt | [Himantopus himantopus] |
| Stint | - Little Stint | [Calidris minuta] |
| Stint | - Long-toed Stint | [Calidris subminuta] |
| Stint | - Red-necked Stint | [Calidris ruficollis] |
| Stonechat | - European Stonechat | [Saxicola rubicola] |
| Stonechat | - Siberian Stonechat | [Saxicola maurus] |
| Stork | - Marabou Stork | [Leptoptilos crumeniferous] |
| Stork | - Wood Stork | [Mycteria americana] |
| Storm-Petrel | - Leach's Storm-Petrel | [Hydrobates leucorhoa] |
| Storm-Petrel | - Wilson's Storm-Petrel | [Oceanites oceanicus] |
| Surfbird | - Surfbird | [Calidris virgata] |
| Swallow | - Bank Swallow | [Riparia riparia] |
| Swallow | - Barn Swallow | [Hirundo rustica] |
| Swallow | - Cave Swallow | [Petrochelidon fulva] |
| Swallow | - Cliff Swallow | [Petrochelidon pyrrhonota] |
| Swallow | - Northern Rough-winged Swallow | [Stelgidopteryx serripennis] |
| Swallow | - Tree Swallow | [Tachycineta bicolor] |
| Swallow | - Violet-green Swallow | [Tachycineta thalassina] |
| Swan | - Mute Swan | [Cygnus olor] |
| Swan | - Trumpeter Swan | [Cygnus buccinator] |
| Swan | - Tundra (Whistling) Swan | [Cygnus columbianus columbianus] |
| Swan | - Whooper Swan | [Cygnus cygnus] |
| Swift | - Black Swift | [Cypseloides niger] |
| Swift | - Chimney Swift | [Chaetura pelagica] |
| Swift | - White-throated Swift | [Aeronautes saxatalis] |