Utah Prairie Dog - Cynomys parvidens
( J. A. Allen, 1905 )

 

 

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Subspecies: Unknown
Est. World Population:

CITES Status: NOT LISTED
IUCN Status: Endangered
U.S. ESA Status: NOT LISTED

Body Length:
Tail Length:
Shoulder Height:
Weight:

Top Speed:
Jumping Ability: (Horizontal)

Life Span: in the Wild
Life Span: in Captivity

Sexual Maturity: (Females)
Sexual Maturity: (Males)
Litter Size:
Gestation Period:

Habitat:
Habitat consists of grasslands, in level mountain valleys, in areas with deep well-drained soil and vegetation that prairie dogs can see over or through. Prairie dogs dig underground burrow systems, in which the young are born.

They reproduce slowly, relative to other rodents (Hoogland 2001). Females produce only one litter per year, but the probability of weaning a litter each year is only 67% (Hoogland 2001). Although all females copulate as yearlings, only 49% of males do so (Hoogland 2001). For females that wean offspring, mean litter size at first emergence from the nursery burrow is 3.88 (Hoogland 2001). Mating occurs in March or April. Gestation lasts about one month. Young are born in late April or early May. Litter size is 2-10 (average 3-5); female produces one litter per year. Young emerge above ground at six weeks (late May to early June), weaned in about seven weeks, first breed at about two years.

This species prefers to live in colonies ("towns"). Colony structure is dynamic in size and location; social units within colony comprise a dominant male, several females, and the young of the past two years (Matthews and Moseley 1990). Survivorship in the first year is less than 50%; only 30% remain alive at the end of their second year (Hoogland 2001).

It feeds primarily on grasses, alfalfa, leafy aster, European glorybind, wild buckwheats in seed, flowers and seeds of shrubs, and insects when available; also may consume cattle faeces; generally prefers flowers and seeds over leaves. The species is inactive and torpid in severe winter conditions. Adults emerge and begin foraging from mid-March to early April, enter dormancy mid-July to mid-August; juveniles enter dormancy from early October to mid-November; low elevation colonies (below 7,000 ft) generally are two weeks earlier than higher elevation colonies (Spahr et al. 1991).

Range:
This species is found in the southwestern part of Utah, and its range over the past century has declined about 90 percent (Wilson and Ruff 1999). Prior to control programs, the range reportedly extended from Pine and Buckskin valleys in Beaver and Iron counties (perhaps west to Modena in Iron County), north to at least Salina Canyon and near Gunnison in Sevier County (possibly to Nephi), south to Bryce Canyon National Park, and east to the foothills of the Aquarius Plateau (Collier 1974, Pizzimenti and Collier 1975, McDonald 1997). More recently, this species occurred in substantial populations in only three areas: the Awapa Plateau, along the east fork of the Sevier River, and in eastern Iron County; the grass and Sevier river valleys, plus three small, widely separated mountain valleys have small populations (Collier 1974, Pizzimenti and Collier 1975). The species is scarce or absent in the Aquarius Plateau, Fremont and Paria valleys, and Salina Canyon (Collier 1974, Pizzimenti and Collier 1975). It occurs only in areas at elevations of 1,500 to 2,700 m asl.

Conservation:
This rodent occurs in several protected areas (D. Tirira pers. comm).

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