Though this fish, whose loud sonorous breathing, or rather blowing, has furnished a proverb to landsmen, is so well known a denizen of the deep, yet is he not popularly classed among whales. But possessing all the grand distinctive features of the leviathan, most naturalists have recognised him for one. He is of moderate octavo size, varying from fifteen to twenty-five feet in length, and of corresponding dimensions round the waist. He swims in herds; he is never regularly hunted, though his oil is considerable in quantity, and pretty good for light. By some fishermen his approach is regarded as premonitory of the advance of the great sperm whale.