Snow Bunting
Snow Goose
Snowy Owl
Snowy Plover
Social Flycatcher
Solitary Sandpiper
Song Sparrow
Sooty Shearwater
Sooty Tern
Sora
South Polar Skua
Southern Martin
Spectacled Eider
Spot-billed Duck
Spot-breasted Oriole
Spotted Dove
Spotted Flycatcher
Spotted Owl

Spotted Rail
Spotted Redshank
Spotted Sandpiper
Spotted Towhee
Sprague's Pipit
Spruce Grouse
Steller's Eider
Steller's Jay
Steller's Sea-Eagle
Stilt Sandpiper
Stonechat
Streak-backed Oriole
Streaked Shearwater
Stygian Owl
Sulphur-bellied Flycatcher
Summer Tanager
Surf Scoter
Surfbird

Swainson's Hawk
Swainson's Thrush
Swainson's Warbler
Swallow-tailed Kite
Swamp Sparrow
Tamaulipas Crow
Tawny-shouldered Blackbird
Temminck's Stint
Tennessee Warbler
Terek Sandpiper
Thayer's Gull
Thick-billed Kingbird
Thick-billed Murre
Thick-billed Parrot
Thick-billed Vireo
Townsend's Solitaire
Townsend's Warbler
Tree Pipit

Tree Swallow
Tricolored Blackbird
Tricolored Heron
Tropical Kingbird
Tropical Parula
Trumpeter Swan
Tufted Duck
Tufted Flycatcher
Tufted Puffin
Tufted Titmouse
Tundra Swan
Turkey Vulture
Upland Sandpiper
Varied Bunting
Varied Thrush