Reeves Muntjac 
Reticulated Giraffe 
Rissos dolphin 
Roan antelope 
Rocky Mountain Elk 
Roosevelt elk 
Rothschild Giraffe 
Sable antelope 
Salt's Dik-Dik 
Sambar 
Scimitar oryx 
Short-beaked common dolphin 
Short-finned Pilot Whale 
Siberian ibex 
Sierra Nevada bighorn sheep 
Sika Deer 
Sitatunga 
Sömmerring's Gazelle 
Southern reedbuck 
Southern right whale 
Sperm Whale 
Spinner dolphin 
Springbok 
Sri Lankan axis deer