Is used at the end of the poem to invite the reader to consider whether it is really the human race that are monstrous, not the shark. Whilst it may look big and scary, it is in fact harmless, whereas humans are dangerous and destructive, and have caused huge damage to the planet through their actions. The question provides a link back to the earlier dismissal of the shark on the part of MacCaig, that he is forced to reconsider.