Siberian Jay
Siberian Rubythroat (beicki)
Sickle-billed Vanga
Sickle-winged Chat
Sierra Nevada Brushfinch
Silver Gull (scopulinus)
Silver Pheasant
Silver-beaked Tanager
Silver-breasted Broadbill
Silvereye
Singing Starling
Slate-colored Seedeater
Slate-throated Whitestart
Slaty Brushfinch
Slaty-backed Chat-Tyrant
Slaty-backed Forktail
Slaty-breasted Rail
Slaty-crowned Antpitta