Slaty Brushfinch
Slaty-backed Chat-Tyrant
Slaty-backed Forktail
Slaty-breasted Rail
Slaty-crowned Antpitta
Slender-billed Crow
Slender-billed Greenbul
Slender-billed Gull
Slender-billed Starling
Slender-billed Weaver
Small Minivet
Small-billed Elaenia
Smew
Smooth-billed Ani
Snail Kite
Snow Bunting
Snowy Egret
Snowy-crowned Robin-Chat
Social Flycatcher