Cactus mouse | |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Rodentia |
Family: | Cricetidae |
Subfamily: | Neotominae |
Genus: | Peromyscus |
Species: | P. eremicus |
Binomial name | |
Peromyscus eremicus (Baird, 1858) | |
native range |
The cactus mouse or cactus deermouse (Peromyscus eremicus) is a species of rodent in the family Cricetidae. It is a species of the genus Peromyscus , a closely related group of New World mice often called "deermice". They are native to desert areas of western North America. [2]
Cactus mice are small cricetid rodents, with large eyes and ears, a pointed snout, and a long monocolor tail. Average dimensions for P. eremicus are as follows: total length, 160 to 211 mm (6.3 to 8.3 in); length of body, 72 to 100 mm (2.8 to 3.9 in); length of tail, 84 to 120 mm (3.3 to 4.7 in); length of hind foot, 18 to 22 mm (0.71 to 0.87 in); length of ear, 13.4 to 20 mm (0.53 to 0.79 in); greatest length of skull, 22.7 to 25.9 mm (0.89 to 1.02 in) and zygomatic breadth, 11.2 to 13.5 mm (0.44 to 0.53 in). Adults weigh between 18 and 40 grams (0.63 and 1.41 oz). Females weigh slightly more than males and are significantly larger in body length, ear length, length of mandible, and bullar width of skull.
Cactus mice can be identified by having naked soles on their hind feet and almost naked flesh-colored tails (as opposed to the furry bicolored tail common in most Peromyscus species), which are usually the same length or longer than the animals' body length. Their ears are nearly hairless, large, and membranous.
Their fur is long and soft; coloration varies between subspecies and between different populations. Color of fur varies from ochre to cinnamon, with white ventral areas, and the sides and top of head slightly grayish. [3] Females tend to be slightly paler in color than males, while juveniles appear more gray than their parents.
Cactus mouse longevity is around one year in the wild, but in captivity can live up to 7.4 years. [4]
Cactus mice are found in dry desert habitats, steppe, and mountain foothills in arid regions of the southwestern United States and northern Mexico, as well as islands off the coast of the Baja California peninsula and in the Gulf of Mexico. [5] [6] Low average temperatures and lack of the mesquite species Prosopis juliflora might limit northern expansion. [3]
The cactus mouse occurs sympatrically with five other deermouse species, including the California mouse, canyon mouse, Eva's desert mouse, mesquite mouse, and the western deermouse.
The cactus mouse feeds on seeds, mesquite beans, hackberry nutlets, insects, and green vegetation. In winter, they rely more on insects; on seeds and flowers in the spring; and seeds, leafy greens, and insects in the summer. In autumn, they transition to their winter diet. [3]
Cactus mice, like most muroids, exhibit crepuscular behavior and may even appear in midday, but are mainly nocturnal. They may be less active during the full moon. They have been described as "shy and excitable, and seldom bites when handled". They vocalize a shrill, high-pitched squeak when frightened. In laboratory studies, cactus mice average a running speed of 8.14 miles per hour (13.10 km/h). [7]
Compared to other Peromyscus species, cactus mice have a lower metabolism. This is thought to be an adaptation to arid environments, and maintained by lower activity of the thyroid gland. They may enter torpor when deprived of food in the winter, and food and/or water in the summer. Below 15 °C (59 °F), they enter torpor more slowly, which may partially explain their southern distribution. In the laboratory, onset of torpor was observed to occur within half an hour of food deprivation. [7] When dehydrated, they reduce eating to conserve water that would be expended during digestion. [8]
They are important as seed predators and as prey items for other animals. [7]
The mating habits of cactus mice are currently not well studied, but are inferred from other Peromyscus species to be promiscuous. They mate year around, but more so during warmer months. Unlike other muroids, male cactus mice have a simple penis, rather than a complex one, and females have two pairs of teats, rather than three. The number of teats in the female cactus mouse correlates with the number of offspring they can raise in their arid environment. Females mate after about two months, however, male sexual maturity age is unknown. [7]
Cactus mice are ideal laboratory animals since they keep clean, live well in captivity, and have a high rate of productivity. They have been proposed for physiological and genetic studies.
There are no known negative effects on humans or human-related activities. [7]
Specimens from Southern California have tested positive for hantavirus, however, infections in this species are likely incidental and localized, rather than a common reservoir. [9]
Peromyscus is a genus of rodents. They are commonly referred to as deer mice or deermice, not to be confused with the chevrotain or "mouse deer". They are New World mice only distantly related to the common house and laboratory mouse, Mus musculus. From this relative, Peromyscus species are distinguished by relatively larger eyes, and also often two-tone coloring, with darker colors over the dorsum (back), and white abdominal and limb hair-coloring. In reference to the coloring, the word Peromyscus comes from Greek words meaning "booted mouse". They are also accomplished jumpers and runners by comparison to house mice, and their common name of "deer mouse" is in reference to this agility.
The Wongai ningaui is a tiny carnivorous marsupial native to the arid open grasslands of inland Australia. Their diet is mainly small insects, and occasionally larger prey such as spiders, grasshoppers and cockroaches, which they forage for at the ground and in clumps of spinifex. They have long and untidy fur, grey or gingery brown with longer black hairs, small ears, a narrow muzzle, and possess a partially prehensile tail and feet that allow them to climb. The population occurs sparsely across a wide area and common in favourable habitat, especially in years of good rainfall. Ningaui ridei was first described in 1975, one of two species of a new genus discovered amongst the poorly known mammals of the western regions of Australia.
The Neotominae are a subfamily of the family Cricetidae. They consist of four tribes, 16 genera, and many species of New World rats and mice, predominantly found in North America. Among them are the well-known deer mice, white-footed mice, packrats, and grasshopper mice.
Peromyscus maniculatus is a rodent native to eastern North America. It is most commonly called the eastern deer mouse; when formerly grouped with the western deer mouse, it was referred to as the North American deermouse and is fairly widespread across most of North America east of the Mississippi River, with the major exception being the lowland southeastern United States.
The pinyon mouse is native to the southwestern United States and Baja California in Mexico. These medium-sized mice are often distinguished by their relatively large ears. The range of this species extends from southern Oregon and Wyoming in the north, and extends south to roughly the U.S.-Mexico border, with a disjunct population known as the Palo Duro mouse that occupies an area in the vicinity of Palo Duro Canyon in the Texas panhandle.
The Alabama beach mouse is a federally endangered subspecies of oldfield mouse that lives along the Alabama coast.
Chaetodipus is a genus of pocket mice containing 17 species endemic to the United States and Mexico. Like other members of their family such as pocket mice in the genus Perognathus, they are more closely related to pocket gophers than to true mice.
The canyon mouse is a gray-brown mouse found in many states of the western United States and northern Mexico. Its preferred habitat is arid, rocky desert. Vegetation has little or no effect on the distribution of canyon mice, it is instead associated with rocky substrate than any plant. Canyon mice forage in areas with shrub-like vegetation which can be used for protection against predators. It is the only species in the Peromyscus crinitus species group.
The desert pocket mouse is a North American species of heteromyid rodent found in the southwestern United States and Mexico. True to its common name, the medium-sized desert pocket mouse prefers sandy, sparsely vegetated desert environments.
The brush mouse is a species of rodent in the family Cricetidae. It is found in mountainous areas of Mexico and the western United States at altitudes over 2,000 m (6,600 ft).
The Perote mouse, or Perote deer mouse, is a species of rodent in the family Cricetidae. It is found only in Mexico.
The California deermouse or California mouse is a species of rodent in the subfamily Neotominae in the family Cricetidae. It is the only species in the Peromyscus californicus species group. It is found in northwestern Mexico and central to southern California. It is the largest Peromyscus species in the United States.
The Zacatecan deer mouse or southern rock mouse is a species of rodent in the family Cricetidae. It is found only in Mexico, and is not considered endangered.
The Angel Island mouse, or La Guarda deermouse, is a species of rodent in the family Cricetidae.
Hooper's mouse is a species of rodent in the family Cricetidae. It is the only member of the Peromyscus hooperi species group, and is found only in Mexico. The species is named for Emmett Hooper, a researcher into the taxonomy of the genus Peromyscus.
The Tres Marías island mouse or Tres Marías deer mouse is a species of rodent in the family Cricetidae. It is found only on the Islas Marías off the west coast of Mexico. When last assessed, it was common on María Cleofás Island, but rare or absent on the other, more disturbed, islands.
Alston's brown mouse, also called Alston's singing mouse, short-tailed singing mouse, or singing mouse, is a species of rodent in the family Cricetidae. It is found in Central America, from Chiapas, Mexico, to western Panama.
The narrow-skulled pocket mouse is a species of rodent in the family Heteromyidae. It is endemic to western Mexico, living west of the Sierra Madre Occidental crest.
The Chihuahuan pocket mouse is a species of heteromyid rodent found in the southwestern United States and Mexico. It was formerly considered a subspecies of the desert pocket mouse, but was determined to be a distinct species in 1996, following analysis of its mitochondrial DNA.