There are four types of bear in North America. They are black (Ursus americanus), grizzly (Ursus arctos horribilis), Alaskan brown (Ursus arctos middendorffi), and polar (Ursus maritimus) bears.
Among them, Alaskan brown bears and polar bears are the largest. Male Alaskan brown bears range in size from 800 – 1200 lbs; male polar bears average 1,000 lbs, though are much leaner than Alaskan browns. Very large specimens of each can grow up to 1,500 lbs.
The polar bear is the largest terrestrial carnivore, being twice as large as the Siberian Tiger. Adult males weigh between 350-680 kilograms and measure 7.9-9.8 feet in length. Adult females are about half the size of males normally weighing between 330-550 pounds and measuring between 5.9-7.9 feet. The largest polar bear on record weighed 2,210 pounds.
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