The Chihuahuan pocket mouse (''Chaetodipus eremicus'') is a species of
heteromyid rodent
found in the southwestern United States
The United States of America (USA), also known as the United States (U.S.) or America, is a country primarily located in North America. It is a federal republic of 50 U.S. state, states and a federal capital district, Washington, D.C. The 48 ...
and Mexico
Mexico, officially the United Mexican States, is a country in North America. It is the northernmost country in Latin America, and borders the United States to the north, and Guatemala and Belize to the southeast; while having maritime boundar ...
. It was formerly considered a subspecies of the desert pocket mouse (''C. pencillatus''), but was determined to be a distinct species in 1996, following analysis of its mitochondrial DNA
Mitochondrial DNA (mtDNA and mDNA) is the DNA located in the mitochondrion, mitochondria organelles in a eukaryotic cell that converts chemical energy from food into adenosine triphosphate (ATP). Mitochondrial DNA is a small portion of the D ...
.
Description
Chihuahuan pocket mice are moderately sized rodents, with a total adult length of , including the tail, and weighing . The fur is buff sprinkled with black over the back and sides, and white on the tail and underparts. The hairs on the rump are long and slender, but there are no spines, such as are present on the otherwise very similar rock pocket mouse. The tail is long, measuring , and ends in a large tuft of white fur.
The mice are herbivorous, mainly feeding on the seeds of plants such as broomweed, mesquite, and creosotebush, although they will also eat grasses when seeds are in short supply. They are nocturnal, spending the day in burrows comprising a central chamber from which numerous tunnels fan out to separate openings on the surface. The multiple openings to the burrow are closed during the day. They are most active during the spring, and may enter torpor
Torpor is a state of decreased physiological activity in an animal, usually marked by a reduced body temperature and metabolic rate. Torpor enables animals to survive periods of reduced food availability. The term "torpor" can refer to the ti ...
for a few days at a time during the winter months. Breeding occurs from February to August, with most young being born around May. Litters typically consist of three or four young.[
]
Distribution and habitat
The Chihuahuan desert mouse inhabits the Chihuahuan Desert from western Texas
Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...
and southern New Mexico
New Mexico is a state in the Southwestern United States, Southwestern region of the United States. It is one of the Mountain States of the southern Rocky Mountains, sharing the Four Corners region with Utah, Colorado, and Arizona. It also ...
in the United States, through northern and central Mexico as far as San Luis Potosí. It inhabits desert scrubland, preferring areas with soft or sandy soil, although it may occasionally be found in grassland or by river banks. The dominant vegetation in its habitat normally consists of plants such as mesquite, creosotebush, catclaw, and prickly pears.[ Two subspecies are recognised:][
* ''Chaetodipus eremicus eremicus'' - majority of range
* ''Chaetodipus eremicus atrodorsalis'' - San Luis Potosí
]
References
{{Taxonbar, from=Q5097314
Chaetodipus
Mouse, Chihuahuan Desert Pocket
Rodents of the United States
Mammals described in 1898
Taxa named by Edgar Alexander Mearns