The polar bear is the largest land carnivore. Male polar bears (boars) grow two to three times the size of females (sows). Boars weigh about 350 to more than 650 kg (772-1,433 lb.) and are about 2.5 to 3 m (8.2-9.8 ft.) long. Sows weigh about 150 to 250 kg (331-551 lb.) and are about 1.8 to 2.5 m (6.0-8.2 ft.) long.
https://seaworld.org/animal-info/animal-infobooks/polar-bears/physical-characteristics/
That’s about the size of an “average” Island Black Bear. An average Island Bear will weigh 150-250lbs. An large 6’+ boar could likely weigh 300+ and the big bears do look much different as you can see in the photos. If it’s a big bear you’re after then you need to pay attention to the sign you see around you.
http://bchuntingblog.com/blog/2011/02/05/field-judging-black-bear-size/
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These coastal areas are so rich in salmon that a 40% higher density of brown bears can be supported there (Bauer and Bauer 1996, p 97). Face: Brown bears have a concave or ‘dish-shaped' face (Brown 1993, p 69). Paws: Grizzly bear paws are black or brownish in color with wrinkled skin on the pad (Brown 1993, p 73). Shoulder Hump: Brown bears have a distinguishing shoulder hump. This hump is actually a mass of muscle, which enables brown bears to dig and use their paws as a striking force (Brown 1993, p 77).
http://www.bear.org/website/bear-pages/brown-or-grizzly-bear/68-brown-grizzly-bear-facts.html
A black bear bit and clawed this power pole and left these marks. Another view of a power pole damaged by a black bear. The other side of the same power pole. Bears bite and claw power poles, trees, and limbs of trees in this manner. A photo of a black bear yearling cub caught on a trail camera. A beautiful right front black bear track in mud. This track shows all the details, including all five toes. The claws do not always leave marks in the tracks.
http://www.bear-tracker.com/blackbeartracksandsigns.html
Taxonomy: While there has been much confusion about the taxonomy of brown bears (Ursus arctos), taxonomists agree there are at least two subspecies in North America -- the grizzly bear (U. a. horribilis) and the Kodiak bear (U. a. middendorffi).
http://www.bear.org/website/bear-pages/brown-or-grizzly-bear/68-brown-grizzly-bear-facts.html
24 Inch Grizzly Bear Paw Print. This is a picture of a rear paw print of a Grizzly Bear (proper name is Alaskan Brown Bear), which was sent to me by Craig Stratton in Alaska. The size of the rear paw of the average full-grown male Grizzly is 15 inches from heel to toe (not counting claws) . The average weight of a Grizzly with a 15-inch paw is around 900 pounds.
http://blackbearheaven.com/24-inch-grizzly-bear-paw-print.htm
Black bear track in drying mud - left front foot. Right front track of a black bear in drying mud. Right front track of a black bear on an old dirt road. Black bear habitat - the dirt road on which the tracks above were found.
http://www.bear-tracker.com/blackbeartracksandsigns.html
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Polar bears have large paws compared to body size, reaching 30 cm (12 in.) in diameter. The large paws of a polar bear act like snowshoes, spreading out the bear's weight as it moves over ice and snow. Polar bear paws can reach 30 cm (12 in.) in diameter. The forepaws are round and partially webbed.
https://seaworld.org/animal-info/animal-infobooks/polar-bears/physical-characteristics/
width of a bear paw
The width of a bear paw is 15 inches from heel to toe.