sadly the whales and dolphins and seals , too clever by half , stayed well-clear of him , much to his disappointment : he did not much like tunny or sharks , the latter of which occasionally beat themselves against his limbs in confused fits perhaps provoked by some traces of blood or flesh from his latest repast : on one occasion he brought back one of these to show , a monster some nineteen feet in length , weighing close on two tons , with its angry snoutish face full of teeth .