Polar bears are classified as marine mammals (just like seals, whales, and dolphins) because they spend so much time out on the sea ice and depend on the ocean to live. Of course, unlike whales, polar bears can walk and even run on land. Polar bears are generally considered the biggest bears on earth! Like this video if you want to see more videos about ANIMALS! Subscribe to FreeSchool: https://www.youtube.com/user/watchfreeschool?sub_confirmation=1 Visit us on Facebook: https://www.faceboo