They are beasts of the larger lakes in Q. They seldom surface, hence they are not widely known, nor is their danger appreciated. But, when they do surface, they have been known to upset or swamp canoes, endangering the paddlers, who have been known to be tasty hors doevers for these beasts. I once broke my favorite paddle defending myself from attack with a sharp blow to the snout. They seem to be especially sensitive there, as the piercing screams haunted me and my party all through the night. :o