It is a carnivorous mammal and is staggeringly large in size, with a weight of about 350-700 kg. The Polar bear is a sister species of the brown bear and they can survive in areas with freezing temperature that is surrounded by open water, ice and snow.They hunt seals for food. Seals form the major portion of their diet. Polar bears are well known to survive in both the sea and land, and as they spend most of their time on the sea ice they are also known as maritime or marine animals.