Jord: Dawn of a World
Whale-sharks are gigantic sharks capable of single handedly destroying large cargo ships, often consuming their entire cargo in the process. Any ship that sails further out to sea than the relative immediacy of the coast is at risk of running into one of these massive beasts, and deep-sea travel across Jord is virtually unheard of due to these creatures.
Very few sailors tend to survive a whale-shark attack, and those that do typically survive only by jumping overboard at the first sign of the predator, and swimming away as quickly as possible during the devouring frenzy.
Whale-sharks seldom swim alone, being frequently accompanied by schools of smaller sharks that greedily snap up any scraps left behind by the giant behemoths.