| Townsend's pocket gopher | |
|---|---|
 | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Rodentia |
| Family: | Geomyidae |
| Genus: | Thomomys |
| Species: | T. townsendii |
| Binomial name | |
| Thomomys townsendii (Bachman, 1839) | |
Townsend's pocket gopher (Thomomys townsendii) is a species of pocket gopher endemic to the northwestern United States. [2]
Townsend's pocket gopher is a relatively large gopher, measuring 22 to 29 cm (8.7 to 11.4 in) in total length, including a tail 6 to 10 cm (2.4 to 3.9 in) long. Adults weigh between 190 and 380 g (6.7 and 13.4 oz), with males being significantly larger than females. Like other pocket gophers, they have a large head, a short, muscular neck, small eyes and ears, and short legs. The forefeet are large with powerful digging claws, while the hindfeet are stout, with flat soles. There is a fur-lined cheek pouch on either side of the mouth, from which the name "pocket gopher" derives. Females have eight teats. [3]
The fur is greyish in color over most of the body, but a richer tan on the underparts. There is a patch of white fur on the chin, and some individuals also have white markings on the head. The tail is almost entirely hairless. [3] Melanistic individuals have also been reported, being almost entirely black in color, apart from white spots on the chin or feet. [4]
Townsend's pocket gopher is found in disjunct populations across southern Idaho, northern Nevada, southeastern Oregon, and northeastern California. [1] They inhabit land with deep, moist soils close to rivers and lakes, occasionally as high as 1,980 m (6,500 ft), but more usually in lower valley bottoms. They may also be found in high numbers in artificially irrigated cropland. Their expansion into neighboring areas may be limited by absence of saltgrass, or by competition with Botta's pocket gopher. [3]
Two subspecies are currently recognised: [2]
Townsend's pocket gopher feeds largely on the root-stalks of saltgrass, but also eats other grasses, alfalfa, and other large rooted plants, including agricultural crops such as potatoes. Common predators include barn owls, [5] and the gopher is also considered to be the primary host of the chewing louse Geomydoecus idahoensis. [3] Breeding probably occurs around January or February, and litters average seven young. Mating is promiscuous, and based on female choice. [6] Hybrids between Townsend's and Botta's pocket gophers have been reported. [6]
Like other pocket gophers, Townsend's species spends most of its adult life underground. Burrows are 10 to 12 cm (3.9 to 4.7 in) wide, and are marked on the surface by numerous mounds of excavated soil. The entrances to the tunnels are normally kept blocked with soil to prevent access by predators. Individuals are solitary outside of the breeding season. [3]
The great grey owl is an owl, which is the world's largest species of owl by length. It is distributed across the Northern Hemisphere, and it is the only species in the genus Strix found in both Eastern and Western Hemispheres. In some areas it is also called the Phantom of the North, cinereous owl, spectral owl, Lapland owl, spruce owl, bearded owl, and sooty owl.
The ferruginous hawk is a large bird of prey and belongs to the broad-winged buteo hawks. An old colloquial name is ferrugineous rough-leg, due to its similarity to the closely related rough-legged hawk.
John Kirk Townsend was an American naturalist, ornithologist and collector.
Pocket gophers, commonly referred to simply as gophers, are burrowing rodents of the family Geomyidae. The roughly 41 species are all endemic to North and Central America. They are commonly known for their extensive tunneling activities and their ability to destroy farms and gardens.
The smooth-toothed pocket gophers, genus Thomomys, are so called because they are among the only pocket gophers without grooves on their incisors. They are also called the western pocket gophers because they are distributed in western North America. They are considered distinct enough from other pocket gophers to be recognized as a separate subfamily or tribe.
The white-tailed jackrabbit, also known as the prairie hare and the white jack, is a species of hare found in western North America. Like all hares and rabbits, it is a member of the family Leporidae of order Lagomorpha. It is a solitary individual except where several males court a female in the breeding season. Litters of four to five young are born in a form, a shallow depression in the ground, hidden among vegetation. This jackrabbit has two described subspecies: L. townsendii townsendii occurring west of the Rocky Mountains and L. townsendii campanius occurring east of the Rocky Mountains.
The Mazama pocket gopher is a smooth-toothed pocket gopher restricted to the Pacific Northwest. The herbivorous species ranges from coastal Washington, through Oregon, and into north-central California. Four subspecies of the Mazama Pocket Gopher are classified as threatened under the Endangered Species Act of 1973, including T. m. pugetensis, T. m. tumuli , T. m. glacialis, and T. m. yelmensis. The Mazama Pocket Gopher is one of the smallest of 35 species in the pocket gopher family.
Botta's pocket gopher is a pocket gopher native to western North America. It is also known in some areas as valley pocket gopher, particularly in California. Both the specific and common names of this species honor Paul-Émile Botta, a naturalist and archaeologist who collected mammals in California in 1827 and 1828.
The gray-tailed vole also known as the gray-tailed meadow vole or gray-tailed meadow mouse, is a rodent in the genus Microtus of the family Cricetidae. Voles are small mammals, and this species lies roughly in the middle of their size range. First collected in 1895, it is endemic to the Willamette Valley, Oregon, and Clark County, Washington, in the Pacific Northwest region of North America. Historically, they were found in the prairie areas of the Valley and, though many of these areas have been converted for agricultural purposes, these animals remain common. For reasons that remain unclear, vole population densities in any area may fluctuate widely from season to season and year to year. They are preyed upon by owls, hawks, and carnivorous mammals, and their parasites include fleas and ticks. These voles build burrows and complex tunnel networks, which they sometimes share with other burrowing animals. Relatively little is known about their behavior in the wild, because they are elusive and unlikely to enter traps.
The southeastern pocket gopher is a species of pocket gopher that is native to the southeastern United States. It occurs in Alabama, Georgia, and Florida, where it is the only pocket gopher.
Townsend's vole is a species of rodent in the family Cricetidae, the sister species of M. canicaudus. It is found in temperate grasslands of British Columbia in Canada and in the states of Washington and Oregon in the United States.
The little desert pocket mouse is a species of small rodent in the family Heteromyidae. It is endemic to Baja California in Mexico.
The plains pocket gopher is one of 35 species of pocket gophers, so named in reference to their externally located, fur-lined cheek pouches. They are burrowing animals, found in grasslands and agricultural land across the Great Plains of North America, from Manitoba to Texas. Pocket gophers are the most highly fossorial rodents found in North America.
Townsend's ground squirrel is a species of rodent in the family Sciuridae. It is found in high desert shrublands in several areas of the United States.
The camas pocket gopher, also known as the camas rat or Willamette Valley gopher, is a rodent, the largest member in the genus Thomomys, of the family Geomyidae. First described in 1829, it is endemic to the Willamette Valley of northwestern Oregon in the United States. The herbivorous gopher forages for vegetable and plant matter, which it collects in large, fur-lined, external cheek pouches. Surplus food is hoarded in an extensive system of tunnels. The dull-brown-to-lead-gray coat changes color and texture over the year. The mammal's characteristically large, protuberant incisors are well adapted for use in tunnel construction, particularly in the hard clay soils of the Willamette Valley. The gophers make chattering sounds with their teeth; males and females make purring sounds when they are together, and the young make twittering sounds. Born toothless, blind and hairless, the young grow rapidly before being weaned at about six weeks of age.
The Idaho pocket gopher is a species of rodent in the family Geomyidae. It is rather small, with a lightly built skull. Its fur color varies through the body and between individuals. Found in the western United States, it inhabits savannas, shrubland, and grasslands. Individuals live alone in burrows, staying active year-round. Many aspects of its behavior and biology are not well understood. The species is classified as being of least-concern by the International Union for the Conservation of Nature.
The southern pocket gopher is a species of rodent in the family Geomyidae. It is found in Mexico and the United States, usually in high altitude grassland and shrubland. It feeds on plant material and has an extensive burrow above which is a large heap of earth on the surface of the ground.
