Richardson's ground squirrel 
Ring-tailed lemur 
Ring-tailed mongoose 
Rio Mayo titi 
Rissos dolphin 
Roan antelope 
Rock hyrax 
Rock squirrel 
Rocky Mountain Elk 
Rodrigues flying fox 
Roloway monkey 
Roosevelt elk 
Rothschild Giraffe 
Round-tailed ground squirrel 
Ruddy Mongoose 
Rufous rat-kangaroo 
Ruwenzori Sun Squirrel 
Sable antelope 
Saddleback Tamarin 
Salt's Dik-Dik 
Sambar 
Samoa flying fox 
Sand Rat 
Sanfords brown lemur