Wildlife Species Guide
<< Back to Index | Description
The scientific name for the black-tailed prairie dog "ludovicianus," is the Latin form of Ludwig or Louis,
relating back to the Lewis and Clark expedition of 1804-1806,
when prairie dogs were first collected for science.
the prairie dog is a burrowing member of the order Rodentia,
the largest group of mammals in the world. An adult black-tailed
prairie dog is between 12 and 16 inches long and generally
weighs between 1.5 and 2.5 pounds. Its tail is covered with hair
and is about one-fourth of the animal's total length. Its body is
tan to pale brown in color, its underparts are white to buffy white,
and its tail is tipped with black. The prairie dog's legs are short,
but its feet are large and have well-developed claws, especially
on the forefeet. Its head is broad and rounded, and its eyes are
DISTRIBUTION AND ABUNDANCE
The black-tailed prairie dog is one of five species of prairie dogs
found in North America. It is the most abundant and widely distributed
species and is the only prairie dog found in Nebraska. It is found
throughout the Great Plains from southern Canada to just inside
Mexico. The western edge of its range is along the Rocky
Mountains, and the eastern edge follows the natural boundary
between tall and mid-grass prairie. In Nebraska, prairie dogs are
found roughly in the western two-thirds of the state.
Black-tailed prairie dogs live in colonies or "towns" that
range in size from as small as one acre to several thousand acres.
The largest prairie dog colony on record was in Texas, and was
about 100 miles wide, 250 miles long and contained an estimated
400 million animals. It is estimated that in the late 1 800s, some
700 million acres of North American rangeland were inhabited
by prairie dogs. Habitat changes and extensive eradication efforts
have reduced the acreage by about 90 to 95 percent from
HABITAT AND HOME
Areas of short and mid-grass rangeland overgrazed by livestock are
the prairie dog's preferred habitat. Prairie dog colonies are most
recognizable by the mounds and holes at their burrow entrances.
A colony will typically have 30 to 50 burrow entrances per acre.
The animal's burrow system can be quite complex and extensive. Mounds of
excavated soil around the burrow entrance are generally cone-shaped and
vary from one to three feet in height and from three to 10 feet in
diameter. These mounds serve as lookout points and serve to prevent
water from entering the burrow system. Tunnels are generally three to
six feet below the surface and about 15 feet long, although burrows
have been reported to reach depths of 15 feet. Burrow systems
typically include several chambers, including one near the entrance
where the prairie dog can sit and listen for activity above ground,
and one or more nest chambers where they sleep and care for their
The fact that prairie dogs live in colonies indicates
they are highly social animals. The largest social unit is the
colony or town. Towns are often divided into "wards" by
topographical barriers such as roads, ridges or trees, and are
generally five to 10 acres in size. Although prairie dogs in one
ward may be able to see and hear animals of an adjacent ward,
movement among wards is unusual. Wards are divided into
several smaller prairie dog social units, called "coteries." Each
coterie generally consists of one adult male, one to four adult
females, and any offspring less than two years old. Members of
one coterie defend their territory from invasion by members of
Prairie dogs are active during the day, usually from about
sunrise to sunset, and during summer they spend about one-third
to one-half of the daylight hours feeding. Another third is involved
in social interactions with other colony members as well
as working on burrows and mounds and responding to alarm
calls. The remainder of daylight is spent underground, especially
during mid-day when temperatures above ground are high.
The black-tailed prairie dog is active all year. In winter, it
remains underground for several days when weather is severe,
but comes out on sunny afternoons to look for food and bask in
Black-tailed prairie dogs exhibit an elaborate communication
system. At least 11 separate calls have been identified, and a
variety of postures and displays are utilized. Calls range from
signals of alarm to "all-clear." Physical contact is another
method of prairie dog communication. Mouth-to-mouth contact
is used to identify coterie members from strangers, and groom-
ing among coterie members is common.
Grasses are the preferred food of the prairie dog, and
generally makes up about three quarters of its diet. In the fall,
broadleaf forbs become more important as green grass is less
available. In winter, any available green vegetation is consumed. In
the spring and summer, each prairie dog consumes up to two pounds of
vegetation per week.
In addition to the vegetation it eats, the prairie dog also clips,
but does not eat, much vegetation within its colony. This is
probably done to keep the vegetation clipped short to provide an
unobstructed view of approaching predators. Over a period of
time, clipping, foraging and digging activities can alter the
composition of the vegetation in a prairie dog town. Short native
grasses like buffalograss and the grama grasses are favored
when an area is used by prairie dogs for a long period of time.
A prairie dog reaches sexual maturity after its first winter and has one
litter per year. Breeding takes place in March and early April, and a
litter of usually four to six young is born 30 to 35 days later.
Young prairie dogs are born hairless, helpless, and with their eyes
closed. They remain underground for about six weeks and first emerge
from the den in May or June. They are weaned at this time and begin
feeding on green vegetation. They reach adult size by fall.
Although the prairie dog has been known to live for at least eight years
in captivity, its average life span in the wild is usually three to four
years. In addition to actions of man, the prairie dog faces many natural
predators. Badgers are probably the main predator, but coyotes, weasels,
golden eagles, hawks, swift fox, and other predators take prairie dogs.
Bullsnakes and rattlesnakes take young prairie dogs but generally not
adults. The black-footed ferret was once a primary prairie
dog predator, but it is now considered an endangered species and
no wild ferrets have been verified in Nebraska since the 1940s.
A prairie dog is susceptible to a number of diseases, the most
notable being plague. Plague is an infectious disease transmitted
by the bite of an infected flea. Plague can be devastating to prairie
dog populations, wiping out entire colonies in some areas. This
disease was known as "black death" in the 1 300s when about
one-third of Europe's human population was lost. Although it
can be transmitted to humans through the bite of an infected flea,
plague has not been found in prairie dogs in Nebraska and is now
treatable in humans.
In many ways, a prairie dog town can be considered a biological oasis.
Many wildlife species associate with prairie dogs. Some species feed
on prairie dogs, but others utilize the burrow systems or the unique
habitat to fulfill their needs. Vacapt burrows are used by cottontail
rabbits, several species of small rodents and by burrowing owls.
Meadowlarks, grasshopper sparrows, and other birds are found in
greater numbers in prairie dog towns than in the surrounding
rangeland because they are attracted to the open spaces,
where seeds and insects are more accessible.
But, the prairie dog is not always compatible with agricultural
interests. By eating and clipping vegetation, the prairie dog does
compete with livestock. The economic impact of the prairie dog
on rangeland is difficult to assess and depends on a number of
factors including the density of prairie dogs, the amount of
rainfall, the presence of livestock, and the condition of rangeland
in the surrounding area.
However, the prairie dog and large grazing animals can
benefit from each other's presence. In areas where there is taller
vegetation, domestic livestock keep vegetation cropped low,
which allows the prairie dog to occur in areas where it wouldn't
otherwise be found. On the other hand, when bison roamed the
plains in massive numbers, they spent considerable time foraging in prairie
dog towns, as does livestock to'day. The prairie dog's feeding and clipping
activities stimulate new plant growth that is of higher quality and
more desirable to livestock. Consequently, the loss of some rangeland
to prairie dogs can easily be overestimated if livestock are also using
Most landowners are tolerant of small numbers of prairie dogs
but are concerned about large colonies or expanding populations.
Effective control measures safe for humans and the environment
are available and are used by landowners and governmental
agencies. Some recent research is showing promise for nonlethal measures
to control prairie dog numbers, including the installation of barrier
fences in the colonies, and fencing to exclude livestock.
In addition to their importance to landowners and other
wildlife species, prairie dogs are also important to wildlife
observers, photographers, and recreational shooters.
Although prairie dog numbers fluctuate considerably in many areas primarily
due to extensive control measures, the numbers in Nebraska in recent years
appear to be healthy and increasing where they are not controlled. The
Nebraska Game and Parks Commission has maps that show the distribution and
abundance of prairie dog colonies in various parts of the state.