In former times, whales were not whales. They were horrible, cold-blooded sea monsters, sea serpents, the worst sort of plotting reptilian, bent on ruining the perfect plan. They were evil, not to be saved, either by conversion or relocation or reintroduction to the wild. But something has changed. Modern zookeepers keep serpents in deep jungle habitats, not only behind glass but behind double and triple layers of green brambles, far away from the aquatic mammals.