Mountain Goat 
Mountain gorilla 
Mountain ground squirrel 
Mountain tapir 
Mountain zebra 
Moustached guenon 
Mule 
Mule Deer 
Müllers Bornean gibbon 
Muskox 
Muskrat 
Naked mole-rat 
Namdapha flying squirrel 
Narrow-striped Mongoose 
Neotropical otter 
New Guinea big-eared bat 
New Guinea Singing Dog 
New Zealand sea lion 
Nicaragua White-tailed deer 
Nile lechwe 
Nilgai 
Nilgiri langur 
Nilgiri tahr 
Nine-banded armadillo