Mammal Species of the World
Click here for The American Society of Mammalogists species account
- Original description: Thomas, O., 1887. Diagnosis of a new species of Hesperomys from North America. Annals and Magazine of Natural History, ser. 5, 19:66.
occurs (regularly, as a native taxon) in multiple nations
Regularity: Regularly occurring
Type of Residency: Year-round
Global Range: Central Mexico (Michoacan, central Hidalgo, and central Veracruz) north to southern Sonora, southeastern Arizona and southwestern New Mexico, and central and eastern Texas and southern Oklahoma (Eshelman and Cameron 1987, Caire 1991). Range expanding; see Choate et al. (1990) for discussion of northward and westward dispersal through Texas.
Length: 12 cm
Weight: 10 grams
Comments: Coastal prairie, midgrass prairie, mixed-desert shrub, prickly pear-shortgrass, sandy sage-juniper-mesquite grass- land, postoak savanna, pine-oak, oak-hickory, swales, along roadsides; areas with dense ground cover (Eshelman and Cameron 1987). Makes own runways or uses those of cotton rats or other mammals. Nests usually under fallen log, prostrate cactus pads, or in thick clumps of grass (A87ESH01NA).
Habitat and Ecology
It eats the stems and fruit of prickly pear cactus, grass seeds, grass leaves, mesquite beans, and granjero berries. It breeds year-round with peaks in late fall and early spring. Gestation lasts 20 to 23 days, the litter size averages 2.5 (range 1 to 5). The mouseâs median life span is 23 weeks, with a maximum record life span of 170 weeks for laboratory-reared animals (Wilson and Ruff, 1999).
Non-Migrant: Yes. At least some populations of this species do not make significant seasonal migrations. Juvenile dispersal is not considered a migration.
Locally Migrant: No. No populations of this species make local extended movements (generally less than 200 km) at particular times of the year (e.g., to breeding or wintering grounds, to hibernation sites).
Locally Migrant: No. No populations of this species make annual migrations of over 200 km.
Comments: Feeds chiefly on vegetation, particularly seeds. Eats cactus stems and fruit when available. Occasionally eats invertebrates and small vertebrates.
Home range estimates range from 45 to 729 sq m; home ranges often overlap. In some regions, populations may decline when SIGMODON HISPIDUS is abundant. Population density has been estimated at 2-84/ha in different habitats (Eshelman and Cameron 1987).
Life History and Behavior
Comments: Apparently mainly crepuscular; often the first species to be caught in traps in the evening. Active year-round.
Lifespan, longevity, and ageing
Breeds year-round in southern Texas; peaks in late and early spring (late winter to fall in northern Texas, Choate et al. 1990). Gestation lasts 20 days (or more if female is lactating). Young are weaned in 17-24 days. Prodcues several litters of 1-5 young per year. Sexually mature in 1-3 months (Eshelman and Cameron 1987).
Molecular Biology and Genetics
Statistics of barcoding coverage: Baiomys taylori
Public Records: 0
Specimens with Barcodes: 1
Species With Barcodes: 1
National NatureServe Conservation Status
Rounded National Status Rank: N4 - Apparently Secure
NatureServe Conservation Status
Rounded Global Status Rank: G4 - Apparently Secure
IUCN Red List Assessment
Red List Category
Red List Criteria
Comments: Avoids areas with high densities of imported fire ants (Killion et al. 1995).
Northern pygmy mouse
The northern pygmy mouse (Baiomys taylori) is a species of rodent in the family Cricetidae. It is known as ratón-pigmeo norteño in the Spanish-speaking areas of its range. It is found in Mexico and the United States.
- Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp. 894–1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore.
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Names and Taxonomy
Comments: See Calhoun et al. (1989) for information on biochemical variation in Baiomys.