Males are 8 to 11 feet long and weigh 500 to 1,100 pounds but can reach as much as 1,500 pounds. Females are smaller, measuring 6 to 8 feet long, and weigh from 350 to 600 pounds, occasionally reaching 700 pounds.
The polar bear is a circumpolar species sometimes regarded by authorities as a marine mammal found in and around the Arctic Ocean whose southern range limits are determined by pack ice (their southernmost point is James Bay in Canada). While their numbers thin north of 88 degrees, there is evidence of polar bears all the way across the Arctic. Population estimates are generally just over 20,000.
In April 2006, the first, and to date only, grizzly-polar bear hybrid found in the wild was killed by a sport hunter at Banks Island, Northwest Territories, Canada. A DNA test conducted by Wildlife Genetics International in British Columbia confirmed that it was a hybrid, with the mother a polar bear and the father a grizzly. You can see pictures and read about hybrids here.