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Bryce CanyonUtah Prairie Dogs |
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Bryce Canyon
National Park Service
U.S. Department of the Interior
Bryce Canyon National Park
Utah Prairie Dog
(Cynomys parvidens)
All photos by Kevin Doxstater
Prairie Dogs are ground-dwelling members of the squirrel family found only in North
America. There are five species within the genus and the Utah Prairie Dog is the smallest
member of the group. Restricted to the southwestern corner of Utah, they are a threatened
species that has suffered population declines due to habitat loss and other factors.
Vital Statistics
Utah Prairie Dogs range from 12 – 16 inches
(30.5 – 40.6 cm) in length and weigh from
1 – 3 pounds (.45 – 1.4 kg). Color ranges
from cinnamon to clay and they have a fairly
distinct black eyebrow (or stripe) not seen
in any of the other 4 prairie dog species.
Their short tail is white tipped like that of
their close relative the White-tailed Prairie
Dog . Utah Prairie Dogs reach maturity in
1 year; females have a life span of about
8 years, males live approximately 5 years.
Interestingly, they are the only nonfish vertebrate species endemic (found
nowhere else in the world) to the State of
Utah.
Habitat and Diet
Like the other members of the genus,
Utah Prairie Dogs live in colonies or
“towns” in meadows with short grasses.
Individual colonies will be further divided
into territories occupied by social groups
or clans which are made up of (usually)
1 male, 1 or more females, and first-year
offspring. The colonies can be occupied by
as little as one clan to several. Burrows can
be from 3 to 6 feet (.9 to 1.8 meters) deep
and up to 15 feet (4.6 m) long with small
chambers near the entrance to listen for
activity above ground and larger, deeper
chambers for sleeping and pup rearing.
Mounds at the entrance to the burrows
serve as lookout stations and to limit the
amount of water entering the tunnels.
for the remaining time. These include
serving as a sentry looking for intruders or
predators, play, mutual grooming, defense
of territory or young, or burrow and nest
construction.
As noted above, there can be several
territories within a colony and an intruder
will be met with barking, chasing, or on
occasion a fight may take place between
adults. Pups will frequently cross over into
other territories and play with neighboring
pups, though sometimes an adult will chase
the visitor away or even attack. As food
sources become scarce in the late summer
and early fall, neighboring clans begin to
move into common feeding areas to forage.
In most cases they are tolerant of others,
though there are occasional fights between
members of opposite clans in these
common areas.
Strictly diurnal (active during the day),
Utah Prairie Dogs are rarely, if ever, seen
outside their burrows before sunrise or
after sunset. Approximately 60% of their
time outside is spent foraging near the
burrow, with other activities taking place
Standing guard at the burrow’s entrance.
Utah Prairie Dogs are primarily herbivores
with a diet that consists of grasses, forbs,
and seeds. When available they will also
eat insects. They do not need to be near
water as they glean most of their necessary
intake from the plants they eat, though
they will sometimes lick dew from plants
in the morning. They return to their
burrows during the middle portion of
the day, especially on the hottest days of
summer when moisture loss is greatest.
Breeding
Keystone Species
The winters in southwestern Utah can be
long, especially up on the plateaus, and,
beginning in late October, Utah Prairie
Dogs begin to retreat to their burrows
to hibernate. In March, as Winter slowly
gives way to Spring, they start to become
active again and it is also the time to breed.
Litter sizes range from 1 to 6 pups, with
an average of 4, and are born in late April
or early May following a 30–day gestation.
The pups first emerge from the natal
burrow some 6 weeks later and begin
to explore the outside world. The pups
spend the first week staying close to their
mother, and studies indicate that knowing
what foods to eat is learned during this
period. As the weeks pass they quickly
become more independent and are soon
foraging with other members of the clan
or in common areas with other dogs in
All species of prairie dog are considered
to be “keystone species” by biologists
and the areas around prairie dog colonies
support many diverse plant and animal
species. Their burrows help to aerate the
soil which, in turn, helps to promote plant
growth. Grazing serves to “clip” plants,
stimulating constant, healthy regrowth
through the growing season. For example,
here at Bryce Canyon, Mule Deer can
frequently be seen during the summer
months grazing in prairie dog colonies,
seeking out this younger vegetation which
is higher in nutritional content.
Predator-prey relationships are part of
all healthy ecosystems and prairie dogs
are prey for a variety of species including
hawks, eagles, weasels, badgers, owls, and
rattlesnakes. In some cases, predators
will then use the prairie dog’s burrows
for shelter, denning, or nesting. As noted
previously, a portion of a prairie dog’s
time above ground is spent serving as
a sentry for the clan because of this
predator-prey relationship.
A Threatened Existence
Estimates are that in the 1920’s there were
over 95,000 Utah Prairie Dogs whose
range covered nearly 500,000 acres. By the
early 1970’s there were only about 3,000
remaining in about 40 colonies. Ranchers
poisoned or used other eradication
methods to reduce competition from
prairie dogs on rangeland used for
grazing cattle and sheep, while farmers
did the same due to crop losses caused
by the rodents. Additionally, introduced
Bubonic Plague, transmitted by fleas,
has been responsible for wiping out
entire colonies. In serious danger of
extinction, Utah Prairie Dogs were listed
as Endangered in 1973 and afforded
protection under the Endangered Species
Act. In 1974 they were reintroduced to
Bryce Canyon National Park after having
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Pups first emerge from the burrow about 6
weeks after they are born.
the colony. As the summer draws to a
close the pups are full grown and begin
to disperse, sometimes near their home
colony, though sometimes they move
several miles away.
Pups peaking out of their burrow.
Prairie dogs have developed a complex
set of vocalizations to warn others in the
colony. Though nearly impossible for
the human ear to detect the difference,
their barks are specific to each type
of predator. The “language” is so well
developed that even a domestic dog will
trigger a different bark than a coyote or
fox - and the response by other colony
members is different, too. Studies have
shown that younger prairie dogs, like
human children, have to learn the
language and cannot fully communicate
until they are about 4 to 5 months old.
A prairie dog’s diet consists mainly of plants
been eradicated in the 1950’s and the
park is now home to about 10 colonies
averaging 200 total individuals. With
populations of Utah Prairie Dogs
increasing slightly their status was
changed in 1984 from endangered to
threatened where it remains today.