San Diego pocket mouse | |
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In Riverside County, California, US | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Rodentia |
Family: | Heteromyidae |
Genus: | Chaetodipus |
Species: | C. fallax |
Binomial name | |
Chaetodipus fallax (Merriam, 1889) | |
The San Diego pocket mouse (Chaetodipus fallax) is a rodent species in the family Heteromyidae. [2] It occupies the northern region of Baja California near San Diego extending into Mexico.
The San Diego pocket mouse occupies the northern region of Baja California near San Diego extending into Mexico. This moderately sized mouse is characterized by dark brown fur covering the top of its body with white fur on its underside. Its length ranges from 170 to 200 mm and its weight is approximately 17–22 g. The San Diego pocket mouse is a homoeothermic endotherm with both hypsodont and lophodont teeth. Similar species include C. californicus, which shares the same habitat.
The San Diego pocket mouse is often a solitary animal, which makes it difficult to study its reproductive history. Many individuals mate in the spring, but others have been known to mate throughout the year. Reproduction occurs 1–3 times a year. There is significant evidence that correlates reproductive events with rainfall. An average litter is composed of 2–6 individuals with an average gestation period of 24–26 days. Females serve as the primary caregivers for their offspring, nursing young and protecting them inside their burrows.
San Diego pocket mice have a lifespan ranging from four months to two years in the wild. Mortalities often result from predation, which increases in the spring when mice are actively foraging, reproducing and defending territories. In captive studies without predation, individuals have been known to live up to six years.
The San Diego pocket mouse is built for slow quadrupedal locomotion. At higher speeds, the pocket mouse “gallops” by hitting the ground with both feet and using its tail for balance. The mice forage at night in attempt to avoid predators. Food is gathered in cheek pouches and stored in separate burrow chambers. Burrows serve as the primary habitat for the mouse in the winter during a period of decreased activity. Burrows are divided into separate chambers with one for sleeping and the rest for storing food. Verbal communication may be utilized to indicate the presence of danger in some cases when a mouse squeaks. Large eyes and ears help individuals sense their surroundings.
Males often occupy a home range of 3,500 square metres (38,000 sq ft) while females occupy a range of 2,500 square metres (27,000 sq ft). Territories are often defended to protect habitat from intruders with the exception of potential mates during the breeding season. A typical home range is composed of rocks, sand and herbaceous vegetation for cover. Some common plants seen in these habitats include Yucca and desert scrub.
San Diego pocket mice are granivores and predominantly forage on seeds. Their cheeks have fur-lined pouches for storing seeds. These mice can subsist on seeds alone and are capable of surviving without drinking additional water. In this case, San Diego pocket mice are able to obtain their water through food or metabolic by-products. In high temperatures, San Diego pocket mice consume seeds with high moisture to compensate for evaporative cooling and water loss during warmer weather. If seeds are in short supply, individuals have been known to eat leaves, stems and insects to replace their normal diet.
The San Diego pocket mouse is subject to predation by a variety of predators, including: foxes, coyotes, badgers, owls and snakes. To avoid predation, mice are characterized by a dark pelage that keeps them camouflaged while they are active at night. A varied hopping style deployed by the mice also makes it difficult for predators to catch the mice.
The San Diego pocket mouse has a significant impact on the ecosystem in its ability to aerate the soil through burrowing. The method in which the mice forage for seeds and store them in their cheek pouches is beneficial for seed dispersal in plants. San Diego pocket mice are also host to a number of ticks and fleas. They are also subject to competition with other rodents that share the same niche. Some rodents are able to coexist as rodents that require more moisture consume higher moisture seeds and leave drier seeds for rodents that require more moisture through drinking.
On the ICUN Red List, the San Diego pocket mouse is classified as a species of least concern. The San Diego pocket mouse is under no immediate threat.
Kangaroo rats, small mostly nocturnal rodents of genus Dipodomys, are native to arid areas of western North America. The common name derives from their bipedal form. They hop in a manner similar to the much larger kangaroo, but developed this mode of locomotion independently, like several other clades of rodents.
Heteromyidae is a family of rodents consisting of kangaroo rats, kangaroo mice, pocket mice and spiny pocket mice. Most heteromyids live in complex burrows within the deserts and grasslands of western North America, though species within the genus Heteromys are also found in forests and their range extends as far south as northern South America. They feed mostly on seeds and other plant parts, which they carry in their fur-lined cheek pouches to their burrows.
Perognathinae is a subfamily of rodents consisting of two genera of pocket mice. Most species live in complex burrows within the deserts and grasslands of western North America, They feed mostly on seeds and other plant parts, which they carry in their fur-lined cheek pouches to their burrows.
The rock pocket mouse is one of 19 species of pocket mice in the genus Chaetodipus. It is sometimes grouped in the genus Perognathus.
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 hispid pocket mouse is a large pocket mouse native to the Great Plains region of North America. It is a member of the genus Chaetodipus.
The Arizona pocket mouse is a rodent native to the Sonoran desert. It is a small mouse with a thinly furred tail that is smooth from base to tip. In color it ranges from tan to orange. It is a nocturnal, burrowing animal. It eats seeds, which it carries back to its burrow in its cheek pouches.
The little desert pocket mouse is a species of small rodent in the family Heteromyidae. It is endemic to Baja California in Mexico.
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.
Bailey's pocket mouse is a species of rodent of the subfamily Perognathinae, family Heteromyidae. It is found in Baja California, Sinaloa and Sonora in Mexico and in California, Arizona and New Mexico in the United States.
The California pocket mouse is a species of nocturnal and primarily solitary rodent in the family Heteromyidae.
Nelson's pocket mouse is a species of rodent in the family Heteromyidae. It is found in Mexico and in New Mexico and Texas in United States. It is named in honor of the American naturalist Edward William Nelson.
The Sinaloan pocket mouse is one of 17 species of pocket mice in the genus Chaetodipus. Two subspecies of C. pernix are recognized, C. p. pernix and C. p. rostratus, all are endemic to Mexico.
The spiny pocket mouse is a species of rodent in the family Heteromyidae and order Rodentia. It is found in Baja California in Mexico and in Arizona, California and Nevada.
Merriam's kangaroo rat is a species of rodent in the family Heteromyidae. The species name commemorates Clinton Hart Merriam. It is found in the Upper and Lower Sonoran life zones of the southwestern United States, Baja California, and northern Mexico.
The banner-tailed kangaroo rat is a species of rodent in the family Heteromyidae. It is found in arid environments in the southwestern United States and Mexico where it lives in a burrow by day and forages for seeds and plant matter by night.
The silky pocket mouse is a species of rodent in the family Heteromyidae. It is found in northern and central Mexico and the southwest region of the United States. It is a species of least concern, according to the IUCN, with no known major threats. The silky pocket mouse eats seeds, succulent parts of plants and nuts, and carries food in its cheek pouches. It lives in low valley bottoms with soft soils, among weeds and shrubs, where it burrows in the sand to bury seed caches. The species is more tolerant of harsh habitat conditions than other pocket mice.
Merriam's pocket mouse is a species of rodent in the family Heteromyidae. It is found in northeast Mexico and New Mexico, Oklahoma and Texas in the United States. Its habitat is shortgrass prairie, desert areas with scrub and arid shrubland. The species is named to honor Clinton Hart Merriam, a biologist who first described several other members of the genus Perognathus, and first elucidated the principle of a "life zone" as a means of characterizing ecological areas with similar plant and animal communities.
The Pacific pocket mouse, Perognathus longimembris pacificus, is endemic to California. It lives in sandy coastal soils of the coastal sage scrub ecoregion. It eats seeds and some insects. It was believed to be extinct until 1993, when a small population was discovered. It is now a federally listed Endangered animal species.
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.