Parasites of the northern pygmy mouse include the intestinal nematode "Pterygodermatites baiomydis". The African pygmy mouse has a number of unique traits. The pygmy mouse lemur measures around (head-body length). The African pygmy mouse ("Mus minutoides") is one of the smallest rodents. The northern pygmy mouse ("Baiomys taylori") is a species of rodent in the family Cricetidae. The desert pygmy mouse ("Mus indutus") is a species of rodent in the family Muridae. The southern pygmy mouse ("Baiomys musculus") is a species of rodent in the family Cricetidae. The Thomas's pygmy mouse ("Mus sorella") is a species of rodents in the family Muridae. The gray-bellied pygmy mouse ("Mus triton") is a species of rodent in the family Muridae. The Pygmy mouse phenotype arises from the inactivation of the High Mobility Group I-C ("HMGCI-C").