Schmidtss big-eared bat 
Scimitar oryx 
Scotts sportive lemur 
Scrub hare 
Sea otter 
Sebas short-tailed bat 
Sechuran fox 
Senegal bushbaby 
Serval 
Sherman's fox squirrel 
Short-beaked common dolphin 
Short-beaked echidna 
Short-eared Elephant Shrew 
Short-finned Pilot Whale 
Siamang 
Siberian chipmunk 
Siberian ibex 
Side-striped jackal 
Sierra Nevada bighorn sheep 
Sika Deer 
Silky sifaka 
Silver Mountain Vole 
Silvery gibbon 
Silvery lutung