Polar bears, walruses, narwhals, muskoxen, and beluga whales are the Arctic’s big five. Polar bears are the top predators of the Arctic seas, thriving in Greenland, Wrangle Island, and Franz Josef Land in Canada and Russia. Walruses move in herds along the Arctic coast to hunt clams and mussels. Narwhals are sometimes called unicorns because of their long tusks. Mammoths and Musk ox roamed together during the Ice Age on Wrangel Island in Russia’s far east.