Spotted ground squirrel

Last updated

Spotted ground squirrel
Spotted ground squirrel.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Rodentia
Family: Sciuridae
Genus: Xerospermophilus
Species:
X. spilosoma
Binomial name
Xerospermophilus spilosoma
(Bennett, 1833)
Synonyms

Spermophilus spilosomaBennet, 1833

The spotted ground squirrel (Xerospermophilus spilosoma) is a species of ground squirrel in the rodent family Sciuridae. It is found throughout Mexico and the central and western United States. Characterized by a white spotted back, the spotted ground squirrel is one of the smallest squirrels found in North America. They are mainly herbivorous, but also eat insects. A burrowing mammal, the spotted ground squirrel will make tunnels to store its food, as well as shelter and hibernation quarters. [2]

Contents

Description

Spotted ground squirrel eating, displaying spotted back Spotted Ground Squirrel 8338vv.jpg
Spotted ground squirrel eating, displaying spotted back

The spotted ground squirrel is one of the smallest squirrels to inhabit the northern hemisphere. It has many white linear dorsal spots, as well as a white underbelly. Coloration of the rest of its body varies greatly and can be different shades of brown, black, gray and white. Its skull resembles that of the thirteen-lined ground squirrel, but is slightly broader in the interorbital and rostral regions. A unique characteristic of the skull is the presence of especially large auditory bullae. X. spilosoma has two pelages and molts each year. Adults emerging from hibernation usually display thicker pelages, which are shed by the springtime. Juveniles tend to have darker pelages than their adult counterparts. Fur color can be influenced by environmental surrounds, and it has been found that populations in soil rich areas tend to have darker colorings than grassland living populations. [2]

Distribution and habitat

Distribution of the Spotted ground squirrel Xerospermophilus spilosoma distribution map.png
Distribution of the Spotted ground squirrel

The spotted ground squirrel can range from south central South Dakota, through Nebraska where it inhabits sand hills present there. It's also found in eastern Colorado, northwestern Oklahoma, western Texas, eastern Arizona, western Kansas, the large majority of New Mexico and the southeastern part of Utah. Mexico species distribution is limited to south and central Mexico. It is generally found within areas of deep sand soils where vegetation is sparse and scattered, aligning with the environments of the distributive areas it is found in. Being a burrowing animal, the spotted ground squirrel will inhabit sand hills and dunes where it makes it home and has even been found to dwell within abandoned prairie dog burrows. Spotted ground squirrel burrows are usually found on short grass mesa's or along the banks of rivers. They prefer lighter, more sparse soil to create their burrows with and this is why they dwell in arid, dry landscapes that contain this type of soil. [2]

Diet

The spotted ground squirrel is a herbivore and feeds on seeds and green plant parts. It is generally not to be considered a carnivore. Green grass shoots are consumed in the spring and eventually the flowers and seeds of green plants that arise in the summer. The spotted ground squirrel can also display Insectivore like habits within its diet in the late summer by feeding on mainly Grasshopper larvae. [2]

Behavior

Though the spotted ground squirrel is considered to be generally a burrowing mammal which spends a large portion of its time in hibernation, it spends a majority of its above-ground activity foraging and feeding on food resources. With the rest of its time being dedicated to alert calls, maintenance behavior (resting, sun bathing, grooming) and sexual behavior in males and females. During their mating season sexual behavior plays a larger role in its above ground activity, involving a 'frenzy' like pattern of males entering and exiting their burrows sporadically, most likely observed as a type of courting behavior. The spotted ground squirrel have 7 different alert postures used to warn others about likely predators in the area or to stake a territory claim against other males during mating seasons. Hibernation behavior has been observed to begin in late July and go all the way through to April and May. Seasonal activity cycles occurs during the months of April/May through July/August and is estimated to be 115–135 days for males and 95–125 days for females. [2]

Related Research Articles

<span class="mw-page-title-main">Antelope squirrel</span> Genus of rodents

Antelope squirrels or antelope ground squirrels of the genus Ammospermophilus are sciurids found in the desert and dry scrub areas of the southwestern United States and northern Mexico. They are a type of ground squirrel and are able to resist hyperthermia and can survive body temperatures over 40 °C (104 °F).

<span class="mw-page-title-main">California ground squirrel</span> Species of rodent

The California ground squirrel, also known as the Beechey ground squirrel, is a common and easily observed ground squirrel of the western United States and the Baja California Peninsula; it is common in Oregon and California and its range has relatively recently extended into Washington and northwestern Nevada. Formerly placed in Spermophilus, as Spermophilus beecheyi, it was reclassified in Otospermophilus in 2009, as it became clear that Spermophilus as previously defined was not a natural (monophyletic) group. A full species account was published for this species in 2016.

<span class="mw-page-title-main">Franklin's ground squirrel</span> Species of rodent

Franklin's ground squirrel is a species of squirrel native to North America, and the only member of the genus Poliocitellus. Due to the destruction of prairie, the populations of Franklin's ground squirrel have dwindled, approaching levels of concern. Its decline in the eastern portion of its range is mostly attributed to habitat fragmentation.

<span class="mw-page-title-main">Golden-mantled ground squirrel</span> Species of rodent

The golden-mantled ground squirrel is a ground squirrel native to western North America. It is distributed in the Rocky Mountains of British Columbia and Alberta, and through much of the western United States.

<span class="mw-page-title-main">Northern Idaho ground squirrel</span> Species of rodent

The northern Idaho ground squirrel is a species of the largest genus of ground squirrels. This species and the Southern Idaho ground squirrel were previously considered conspecific, together called the Idaho ground squirrel.

<span class="mw-page-title-main">Hoary marmot</span> Species of rodent

The hoary marmot is a species of marmot that inhabits the mountains of northwest North America. Hoary marmots live near the tree line on slopes with grasses and forbs to eat and rocky areas for cover.

<span class="mw-page-title-main">Yellow-bellied marmot</span> Species of rodent

The yellow-bellied marmot, also known as the rock chuck, is a large, stout-bodied ground squirrel in the marmot genus. It is one of fourteen species of marmots, and is native to mountainous and semi-arid regions of southwestern Canada and western United States, including the Rocky Mountains, Sierra Nevada, and the Great Basin, often living above 2,000 metres. The fur is mainly brown, with a dark bushy tail, yellow chest and white patch between the eyes, and they weigh up to approximately 5 kilograms. They live in burrows in colonies of up to twenty individuals with a single dominant male. They are diurnal and feed on plant material, insects, and bird eggs. They hibernate for approximately eight months starting in September and lasting through the winter.

<span class="mw-page-title-main">Steppe polecat</span> Species of carnivore

The steppe polecat, also known as the white or masked polecat, is a species of mustelid native to Central and Eastern Europe and Central and East Asia.It is listed as Least Concern on the IUCN Red List because of its wide distribution, occurrence in a number of protected areas, and tolerance to some degree of habitat modification. It is generally of a very light yellowish colour, with dark limbs and a dark mask across the face. Compared to its relative, the European polecat, the steppe polecat is larger in size and has a more powerfully built skull.

<span class="mw-page-title-main">Mohave ground squirrel</span> Species of rodent

The Mohave ground squirrel is a species of ground squirrel found only in the Mojave Desert in California. The squirrel was first described in 1886 by Frank Stephens of San Diego. It is listed as a threatened species under the California Endangered Species Act, but not under the federal Endangered Species Act. The IUCN lists this species as near threatened.

<span class="mw-page-title-main">Arctic ground squirrel</span> Species of rodent

The Arctic ground squirrel is a species of ground squirrel native to the Arctic and Subarctic of North America and Asia. People in Alaska, particularly around the Aleutians, refer to them as "parka" squirrels, most likely because their pelt is good for the ruff on parkas and for clothing.

<span class="mw-page-title-main">Belding's ground squirrel</span> Species of rodent

Belding's ground squirrel, also called pot gut, sage rat or picket-pin, is a squirrel that lives on mountains in the western United States. In California, it often is found at 6,500 to 11,800 feet (2,000–3,600 m) in meadows between Lake Tahoe and Kings Canyon. This species is not of conservation concern, and its range includes some protected areas.

<span class="mw-page-title-main">Cape ground squirrel</span> Species of mammal

The Cape ground squirrel or South African ground squirrel is found in most of the drier parts of southern Africa from South Africa, through to Botswana, and into Namibia, including Etosha National Park.

<span class="mw-page-title-main">Round-tailed ground squirrel</span> Species of rodent

The round-tailed ground squirrel, known as "Ardillón cola redonda" in Spanish, live in the desert of the Southwestern United States and Northwestern Mexico. They are called "ground squirrels" because they burrow in loose soil, often under mesquite trees and creosote bushes.

<span class="mw-page-title-main">Columbian ground squirrel</span> Species of rodent

The Columbian ground squirrel is a species of rodent common in certain regions of Canada and the northwestern United States. It is the second largest member of the genus Urocitellus, which is part of the tribe Marmotini, along with marmots, chipmunks, prairie dogs, and other holarctic ground squirrels. They are stout, with short dense fur, which is characteristically tawny across the bridge of the nose. Social encounters sometimes are initiated with kissing behavior and the most common activity above ground is standing at attention. Residing in mountainous terrain and high plains in northern latitudes, they hibernate for 8 to 9 months of the year in burrows, which may be used for many years. They are emaciated when emerging in the spring. The Columbian ground squirrel came to the attention of the scientific community through writings produced by Lewis and Clark, while 21st century molecular genetics has more finely illuminated its ties with other close relatives.

<span class="mw-page-title-main">Mexican ground squirrel</span> Species of rodent

The Mexican ground squirrel is a species of rodent in the family Sciuridae. It is found in Mexico and the United States. One of its closest relatives is the thirteen-lined ground squirrel.

<span class="mw-page-title-main">Perote ground squirrel</span> Species of rodent

The Perote ground squirrel is a species of rodent in the family Sciuridae. It is endemic to Mexico and is currently at risk of extinction. Perote ground squirrels live within the same area as rock squirrels but they use different microhabitats. In one case it also shares its habitat with the Mexican ground squirrel. Perote ground squirrels have traits similar to those of spotted ground squirrels found in the northern Mexican Plateau; however they are larger, have shorter tails and yellow backs. Its skull is relatively narrow with a large braincase and they have heavy, thick teeth. Perote ground squirrels have two annual cycles, an active phase (March–November) and a hibernation phase (December–February). Some overlap may occur in March and November however.

<span class="mw-page-title-main">Little ground squirrel</span> Species of rodent

The little ground squirrel or little souslik, is a species of rodent in the family Sciuridae. It is found from Eastern Europe to Central Asia.

<span class="mw-page-title-main">Rock squirrel</span> Species of rodent

The rock squirrel is a species of rodent in the family Sciuridae. It is native to Mexico and the Southwestern United States, including southern Nevada, Utah, Colorado, Arizona, New Mexico, West Texas, and the panhandle of Oklahoma.

<span class="mw-page-title-main">Asia Minor ground squirrel</span> Species of rodent

The Asia Minor ground squirrel, also known as Anatolian souslik, Anatolian ground squirrel, is a species of rodent in the family Sciuridae. It is found in Armenia, Iran, and Turkey. The scientific name roughly translates as "seed-lover with yellow underparts".

<i>Xerospermophilus</i> Genus of rodents

Pygmy ground squirrels are small ground squirrels in the genus Xerospermophilus, family Sciuridae, containing four species from Mexico and the United States. The members of this genus were formerly placed in the large ground squirrel genus Spermophilus. Since DNA sequencing of the cytochrome b gene showed that Spermophilus was paraphyletic to the prairie dogs and marmots, this group is now separated, along with six other genera. Within the genus, the Mohave ground squirrel and the round-tailed ground squirrel were thought to be close relatives, sometimes a subgenus Xerospermophilus, while the spotted ground squirrel and the Perote ground squirrel were formerly placed in the subgenus Ictidomys.

References

  1. Lacher, T.; Timm, R.; Álvarez-Castañeda, S.T. (2016). "Xerospermophilus spilosoma". IUCN Red List of Threatened Species . 2016: e.T42563A22262899. doi: 10.2305/IUCN.UK.2016-3.RLTS.T42563A22262899.en . Retrieved 12 November 2021.
  2. 1 2 3 4 5 Streubel, Donald; Fitzgerald, James (1978). "Spermophilus spilosoma". Mammalian Species (101): 1–4. doi: 10.2307/3503894 . JSTOR   3503894.