Slaty antwren 
Slaty becard 
Slaty brush finch 
Slaty flowerpiercer 
Slaty Gnateater 
Slaty tanager 
Slaty-backed chat-tyrant 
Slaty-backed Forktail 
Slaty-backed nightingale-thrush 
Slaty-capped flycatcher 
Slaty-capped shrike-vireo 
Slaty-crowned antpitta 
Slaty-headed tody-flycatcher 
Slender-billed greenbul 
Slender-billed inezia 
Slender-billed weaver 
Slender-billed xenops 
Slender-footed Tyrannulet 
Small ground finch 
Small Minivet 
Small-billed elaenia 
Smoke-colored pewee 
Smoky bush tyrant 
Snow bunting