Jokulmorders are immense creatures who spend most of their life swimming through the deepest parts of the artic ocean, searching the water for food and singing in a way rather similar to whales. The average jokulmorder is about 200 feet from the tip of its nose to the end of its tail and weigh around 250 tons. Their young tend to be 30 feet long at birth and weigh only 20 tons or average. Jokulmorders reportedly live to be around 350 years old, and are said to reach lengths upward of 500 feet towards the end of their life.