© Dr. Galen Royer Frysinger
Brown Bears
In their Natural Habitat
The brown bear is the most widely distributed bear and is
found across much of northern Eurasia and North America. It
is one of the largest living terrestrial members of the order
Carnivora, rivaled in body size only by its close cousin, the
polar bear, which is much less variable in size and slightly
larger on average.
Scientific name: Ursus arctos
Weight: 19.84 pound (9 kg) – 81.57 pound (37 kg) (Yearling) ·
220.46 pound (100 kg) – 1,400 pound (635 kg) · 15.43 pound (7
kg) –
Height: 27.56 inch (70 cm) – 60.24 inch (153 cm)
Territory size: 122.78 sq miles (318 km²) (British columbia
population, Male) · 44.40 sq miles (115 km²) (British columbia
population, Female)
Body length: 55.12 inch (140 cm) – 110.24 inch (280 cm) (Head
and body)
Tail length: 2.36 inch (6 cm) – 8.66 inch (22 cm)
Hibernation and Behavior
Common Name: Brown Bear
Scientific Name: Ursus arctos
Type: Mammals
Diet: Omnivores
Group Name: Sloth, sleuth
Average life span in The Wild: 25 years
Size: 5 to 8 ft
Weight: 700 lbs
Size relative to a 6-ft man:
These omnivorous giants tend to be solitary animals, except for females and their
cubs, but at times they do congregate. Dramatic gatherings can be seen at prime
Alaskan fishing spots when the salmon swim upstream for summer spawning. In this
season dozens of bears may gather to feast on the fish, craving fats that will sustain
them through the long winter ahead. In fall a brown bear may eat as much as 90
pounds of food each day, and it may weigh twice as much before hibernation as it
will in spring.
Brown bears dig dens for winter hibernation, often holing up in a suitable hillside.
Females, or she-bears, den while pregnant and give birth during this winter rest,
usually to a pair of cubs. Brown bear cubs nurse on their mother's milk until spring
and stay with her for some two and a half years—so females only reproduce once
every three years.
Adult brown bears are powerful, top-of-the-food chain predators, but much of their
diet consists of nuts, berries, fruit, leaves, and roots. Bears also eat other animals,
from rodents to moose.
Despite their enormous size, brown bears are extremely fast, having been clocked at
speeds of 30 miles per hour. They can be dangerous to humans, particularly if
surprised or if a person gets between a mother bear and her cubs.
Diorama from the Milwaukee Public Museum
More Photos from the MilwMoreaukee Public Museum
diorama from the Milwaukee Public Museumum
More Photos from the Milwaukee Public Museum
Dia
eating salmon