Northern Baja deer mouse

The Northern Baja deermouse ("Peromyscus fraterculus") is a species of deer mouse native to Southern California and the Baja California peninsula as well as several islands in the Gulf of California. "P. fraterculus" was previously considered a subspecies of the cactus mouse ("Peromyscus eremicus") prior to a 2000 study which identified genetic differences and suggested "P. fraterculus" is more closely related to Eva's desert mouse ("P. eva") than to "P. eremicus".