Least chipmunk 
Least pygmy squirrel 
Lesser capybara 
Lesser Egyptian jerboa 
Littledales whistling rat 
Lodgepole chipmunk 
Long-eared Jerboa 
Long-tailed chinchilla 
Malagasy giant rat 
Maritime striped squirrel 
Meadow jumping mouse 
Meadow vole 
Merriams chipmunk 
Mesic Four-striped Grass Rat 
Mexican gray squirrel 
Mexican Hairy Dwarf Porcupine 
Middle East blind mole-rat 
Montane guinea pig 
Mountain ground squirrel 
Muskrat 
Naked mole-rat 
Namdapha flying squirrel 
North American Beaver 
North American deermouse