Polar bear, Ursus maritimus, which means “sea bear”. Polar bear mother and her cub walking on the coastal Tundra. This bear has not had anything to eat for about 8 months. She is waiting for the ice to freeze on Hudson Bay so that she can hunt for Harp Seals. Adult female polar bears weigh from 330 to more than 550 pounds, 150 to more than 250 kilos. The cub is 10-11 months old & still breast feeding. Polars Bears are endangered due to global warming. It is estimated that the Churchill population will be nonviable in 30 years, and it is the largest single Polar bear population. Polar Bears are to Global Warming/Climate Change what Canaries were to Mining. Canon 500D, zoom lens. (Featured in Images of Endearment & Other Groups.) .