The polar bear is a predatory mammal that is able to survive in the coldest conditions. Despite his charm, it is a dangerous animal. Polar bears are clever and inventive. They spend the most part of time in the sea. Leather of a polar bear is actually black that helps it to keep heat. The polar bear can grow to 3 meters in length and weigh to 700 kilograms that makes it the largest predator in the world. The polar bear swim perfectly and can do it without interruption some days even in very cold water.