The information on this page is meant to provide a snapshot
of the habitat needs of grizzly bears (Ursus arctos)
in the Prince George forest district.
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Food |
Grizzly bears have a very broad diet. They spend majority
of their time eating vegetation, but will also eat dead
animals, young deer and moose. They also feed on ants,
wasps, and rodents.
Click
here for a list of plants used by grizzly bears.
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Range |
Grizzlies will move extensively between various areas
for shelter, denning and food sources. Plateau bears
- those living in flat and rolling country at lower
elevations - live in larger areas (referred to as home
ranges), and occur at lower densities than mountain
bears. For plateau bears, adult females may have home
ranges of 64 to 1,607km², while adult male home ranges
are much larger, ranging from 889 to 4,361km². Female
mountain bears - those living in the mountainous areas
of the district - live in home ranges that are from
20 to 284km². Male mountain home ranges vary from 117
to 273km².
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Habitat |
Generally, grizzlies prefer moist, rich, open habitat
that provides hiding opportunities and shade. Bears
also make use of riparian areas (areas close to streams,
lakes and other wetlands), avalanche chutes and old
burned areas. Cutblocks offer some good habitat for
grazing, anting and feeding on berries; however, increased
human activity may reduce use of these areas.
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Spring
- early April to mid July |
Bears leave their dens (referred to as den emergence)
from mid April to late June . They will usually go to
south facing slopes with well developed soil soon after
den emergence. Main spring foods include freshly sprouted
dandelion, stinging nettle and sedges. Avalanche chutes
are used for feeding on emergent vegetation such as
corms and vetches.
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Summer
- mid July to the mid September |
As early vegetation matures, bears will seek out later
melting slopes to take advantage of newly emerging more
succulent vegetation. Cow parsnip is an important food
source in early summer. They will feed on the lower
10-15cm of the stock sometimes for weeks. By mid to
late summer most vegetation will have hardened off.
This is usually when bears start seeking a bountiful
harvest of berries.
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Fall
- mid September to den entry |
Huckleberries are the most used berry throughout the
district. The best crops are usually in forest openings,
especially on old burn sites. Intense bouts of anting
occur until the first hard frost. Most anting consists
of ripping apart dead wood, flipping rocks and logs
to reveal the ants.
When the ground freezes plateau bears dig for the roots
of dandelions and Osmorthiza while mountain
bears continue to dig for glacier lilly bulbs and the
roots of other plants.
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Denning |
Grizzly bears dig their dens in late fall, shortly
before they enter them. Dens are dug into a slope often
using the roots of trees or shrubs for a ceiling. Small
branches and grasses may be used to make a bed in the
den. Evidence of dead lower branches removed from an
area often indicates a den site is nearby. Several day
beds, made of bedding materials, may be found surrounding
the den, and excavated soil and rocks are often visible
form the air. Bears seldom reuse an excavated den but
will often come back to the same vicinity to dig their
new den. |