Dolphin

Dolphins are sleek, clever sea-mammals with a single back fin, two flippers, a driving tail, and toothed jaws set in a bottle-shaped snout. Five to six feet long and grey or blue-grey, they are among the swiftest swimmers in the ocean and speak to one another in piercing whistles, some too high for human ears. They travel in schools, leaping and tumbling for sheer joy and trailing ships to entertain the crew. Gentle by nature, they turn ferocious only to drive off sharks or guard their young, and they have a long-standing fondness for sailors, often guiding the lost to shore or warning of raiders below.