Small-banded Kukri Snake 
Small-eyed Snake 
Small-spotted lizard 
Smith's Mountain Pit Viper 
Smiths Green-eyed Gecko 
Smooth chameleon 
Smooth machete savane 
Smooth Slug Snake 
Smooth Snake 
Smooth-backed Gliding Gecko 
Smooth-scaled Mountain Rat Snake 
Snake-eyed Lizard 
Snouted cobra 
Solomon Islands skink 
Sonoran Desert Horned Lizard 
Sonoran Desert Sidewinder 
Sonoran Spiny-tailed Iguana 
Sonoran Spotted Whiptail 
Sonoran Whipsnake 
South American Bushmaster 
South American Spotted Skink 
South Western Fence Lizard 
Southeast Asian Bockadam 
Southeastern Crown Snake