Merriam's pocket mouse | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Rodentia |
Family: | Heteromyidae |
Genus: | Perognathus |
Species: | P. merriami |
Binomial name | |
Perognathus merriami J. A. Allen, 1892 | |
Merriam's pocket mouse (Perognathus merriami) is a species of rodent in the family Heteromyidae. [2] 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. [1] 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.
Merriam's pocket mouse is a small species with a smooth silky coat. Adults average 115 mm (4.5 in) in total length including a tail averaging 65 mm (2.6 in) but the size and shade vary across the animal's range. The general color is yellowish with a dark sheen caused by the longer guard hairs having black tips. The underparts, legs and feet are white or creamy in color, and the tail is paler on its undersurface. There are dark streaks on the side of the face and a pale ring surrounds the eye. There is a white spot on the inner margin of the ear, a white patch under the ear and a small buff one behind it. [3]
Merriam's pocket mouse is mainly nocturnal and spends the day in a shallow burrow with several entrances. It excavates tunnels by digging with its forefeet and pushing soil backwards with its hind feet, spreading the spoil over the surface of the ground. There are short side tunnels, some used for depositing fecal pellets and others for storing seeds. The mouse has a home range with several burrows located within it, and sometimes conceals itself under rocks or fallen mesquite trees. An entrance to a burrow is often located at the base of a grass tussock or other plant, the roots of which stabilise the earth, and is loosely plugged with soil when the mouse is inside. In one of the burrows is a nest chamber. This has food stores round the edge and a nest of grass, small twigs and husks at one side. In Texas, breeding takes place between March and November. A litter normally consists of three to six young and there may be more than one litter in the year. [3]
At temperatures below 10 °C (50 °F) Merriam's pocket mouse becomes torpid and in some parts of Texas it may become dormant or hibernate in winter. Animals caught by live trapping on a cold night can appear dead in the morning but soon recover when warmed. [3] The diet consists primarily of seeds which it carries back to its burrow in its cheek pouches and consumes there, leaving a littering of husks on the floor. Excess food is cached in store rooms in the burrow. It may also eat some greenstuff and insects. It does not need to drink water because its requirements are met from its food and it passes small quantities of very concentrated urine. [3] In captivity, a Merriam's pocket mouse has lived on a diet of seeds but without water for four years, but the lifespan of wild individuals is shorter and may be in the range of 22 to 33 months. [3]
When both are caught in a single trap, the northern grasshopper mouse (Onychomys leucogaster) has been known to eat Merriam's pocket mouse. Larger predators include the barn owl (Tyto alba), the burrowing owl (Athene cunicularia), the long-eared owl (Asio otus), the loggerhead shrike (Lanius ludovicianus) and gray foxes. [3]
Merriam's pocket mouse has a wide range including some protected areas and a presumed large total population. It is common in places but has a patchy distribution. The population trend is steady and the animal faces no known major threats, so the IUCN has listed it as being of "least concern". [1]
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.
Perognathus is a genus of pocket mouse. Like other members of their family they are more closely related to pocket gophers than to true mice.
The plains pocket mouse is a heteromyid rodent of North America. It ranges from southwestern Minnesota and southeastern North Dakota to northern Texas east of the Rockies, and from northern Utah and Colorado to northern Chihuahua west of the Rockies.
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 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.
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 San Diego pocket mouse is a rodent species in the family Heteromyidae. It occupies the northern region of Baja California near San Diego extending into Mexico.
Goldman's pocket mouse is a species of rodent in the family Heteromyidae. It is endemic to Mexico, where it is threatened by the increasing conversion of its dry, scrubby habitat into agricultural land. As a result, the International Union for Conservation of Nature has assessed its conservation status as being "near threatened".
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.
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.
Phillips's kangaroo rat is a species of rodent in the family Heteromyidae. It is endemic to Mexico. Its natural habitat is hot deserts.
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 olive-backed pocket mouse is a species of rodent in the family Heteromyidae. It is found in the central Great Plains of Canada and the United States where it is widespread and relatively common; the IUCN considers it to be of "least concern".
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.
The San Joaquin pocket mouse or Salinas pocket mouse is a species of rodent in the family Heteromyidae. It is endemic to California in the United States where it lives in desert or semi-desert habitats.
The little pocket mouse is a species of rodent in the family Heteromyidae. It is found in Baja California and Sonora in Mexico and in Arizona, California, Idaho, Nevada, Oregon and Utah in the United States. Its natural habitat is subtropical or tropical dry lowland grassland. It is a common species and faces no particular threats and the IUCN has listed it as being of "least concern".
The Great Basin pocket mouse is a species of rodent in the family Heteromyidae. It is found in British Columbia in Canada and the western United States.
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.
Baird's pocket gopher or the Louisiana pocket gopher is a species of pocket gopher that is native to the southern United States. In total, there are three almost identical species of eastern pocket gopher; Geomys attwateri, G. bursarius, and G. breviceps. G. breviceps is larger in size, G. attwateri is medium-sized and G. bursarius is a bit smaller. Other than by size variation they are not identifiable by external features. Baird's pocket gophers are small rodents with most of their weight on the top half of their bodies.